Search Results

Search found 21331 results on 854 pages for 'require once'.

Page 680/854 | < Previous Page | 676 677 678 679 680 681 682 683 684 685 686 687  | Next Page >

• PostgreSQL: Auto-partition a table

  - by Adam Matan

  Hi, I have a huge database which holds pairs of numbers (A,B), each ranging from 0 to 10,000 and stored as floats. e.g., (1, 9984.4), (2143.44, 124.243), (0.55, 0), ... Since the PostgreSQL table which stores these pairs grew quite large, I have decided to partition it into inheriting sub-tables. I intend to create 100 such tables, each storing a range of 1000x1000. The problem is that these numbers tend to come in large chunks of nearby numbers. It means that in the future, some tables will be nearly empty and some will hold a very large portion of the database. Unfortunately, the distribution of future pairs is yet unknown. I am looking for a way to automatically repartition my table. That means that if a certain subtable holds more than a specific number of pairs, it will be automatically partitioned into four sub-sub tables, and so on. My questions are: Is recursive partitioning and inheritance possible in PostgreSQL 8.3? Will indexes and query plans understand it? What's the best way to split a subtable once it grew too large? I should point out that this isn't a live database, so a downtime of few hours every week is totally acceptable. Thanks in advance, Adam

  Read the article

• Adding a UITapGestureRecognizer to a view then removing seems to short circuit button events

  - by heymon

  In the code below I am popping up a ImageView as the result of a users touchUpInside on a simple info button. There are other buttons on the view. To dismiss the info I added a UITapGestureRecognizer to my controllers view, and hide the view when the tap is detected. If I don't remove the tapGestureRecognizer, the action is called every time some. Even when I do remove the gesture action, no bottons receive touchUpInside events once this gesture recognizer is added. Why? Code from my MainViewController (void) dismissInfo: (UITapGestureRecognizer *)gesture { [kInfoView setHidden: YES]; [gesture removeTarget: self action: NULL]; } (IBAction) displayInfo { CGRect startFrame = CGRectMake(725, 25, 0, 0), origFrame; CGFloat yCenter = [kInfoView frame].size.height/2 + 200; CGPoint startCenter = CGPointMake(724, 25), displayCenter = CGPointMake(384, yCenter); UITapGestureRecognizer *g = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(dismissInfo:)]; [self.view addGestureRecognizer: g]; origFrame = [kInfoView frame]; [kInfoView setCenter: startCenter]; [kInfoView setHidden: NO]; [kInfoView setFrame: startFrame]; [UIView beginAnimations: @"info" context: nil]; [UIView setAnimationDuration: .5]; [UIView setAnimationDelegate: self]; [kInfoView setFrame: origFrame]; [kInfoView setCenter: displayCenter]; [UIView commitAnimations]; }

  Read the article

• C# - Alternative to System.Time.Timer, to call a function at a specific time.

  - by Fábio Antunes

  Hello everybody. I want to call a specific function on my C# application at a specific time. At first i thought about using a Timer (System.Time.Timer), but that soon became impossible to use. Why? Simple. The Timer Class requires a Interval in milliseconds, but considering that i might want the function to be executed, lets says in a week that would mean: 7 Days = 168 hours; 168 Hours = 10,080 minutes; 10,080 Minutes = 6,048,000 seconds; 6,048,000 Seconds = 6,048,000,000 milliseconds; So the Interval would be 6,048,000,000; Now lets remember that the Interval accepted data type is int, and as we know int range goes from -2,147,483,648 to 2,147,483,647. That makes Timer useless in this case once we cannot set a Interval bigger that 2,147,483,647 milliseconds. So i need a solution where i could specify when the function should be called. Something like this: solution.ExecuteAt = "30-04-2010 15:10:00"; solution.Function = "functionName"; solution.Start(); So when the System Time would reach "30-04-2010 15:10:00" the function would be executed in the application. How can this problem be solved? Thanks just by taking the time to read my question. But if you could provide me with some help i would be most grateful. Additional Info: What these functions will do? Getting climate information and based on that info: Starting / Shutting down other Applications (most of them Console Based); Sending custom Commands to those Console Applications; Power down, Rebooting, Sleep, Hibernate the computer; And if possible schedule the BIOS to Power Up the Computer;

  Read the article

• codingBat separateThousands using regex (and unit testing how-to)

  - by polygenelubricants

  This question is a combination of regex practice and unit testing practice. Regex part I authored this problem separateThousands for personal practice: Given a number as a string, introduce commas to separate thousands. The number may contain an optional minus sign, and an optional decimal part. There will not be any superfluous leading zeroes. Here's my solution: String separateThousands(String s) { return s.replaceAll( String.format("(?:%s)|(?:%s)", "(?<=\\G\\d{3})(?=\\d)", "(?<=^-?\\d{1,3})(?=(?:\\d{3})+(?!\\d))" ), "," ); } The way it works is that it classifies two types of commas, the first, and the rest. In the above regex, the rest subpattern actually appears before the first. A match will always be zero-length, which will be replaceAll with ",". The rest basically looks behind to see if there was a match followed by 3 digits, and looks ahead to see if there's a digit. It's some sort of a chain reaction mechanism triggered by the previous match. The first basically looks behind for ^ anchor, followed by an optional minus sign, and between 1 to 3 digits. The rest of the string from that point must match triplets of digits, followed by a nondigit (which could either be $ or \.). My question for this part is: Can this regex be simplified? Can it be optimized further? Ordering rest before first is deliberate, since first is only needed once No capturing group Unit testing part As I've mentioned, I'm the author of this problem, so I'm also the one responsible for coming up with testcases for them. Here they are: INPUT, OUTPUT "1000", "1,000" "-12345", "-12,345" "-1234567890.1234567890", "-1,234,567,890.1234567890" "123.456", "123.456" ".666666", ".666666" "0", "0" "123456789", "123,456,789" "1234.5678", "1,234.5678" "-55555.55555", "-55,555.55555" "0.123456789", "0.123456789" "123456.789", "123,456.789" I haven't had much experience with industrial-strength unit testing, so I'm wondering if others can comment whether this is a good coverage, whether I've missed anything important, etc (I can always add more tests if there's a scenario I've missed).

  Read the article

• What are the correct bindings for an NSComboBox for use with Core Data

  - by theMikeSwan

  Imagine if you will a Core Data app with two entities (Employee, and Department). Employees have a to-one relationship with department (department) and the inverse is a to-many relationship (employees). In the UI you can select individual Employee entities and edit the details in a detail area (there are of course other attributes and there is UI for adding and editing Department entities). When using a popup button the bindings are: content = PopUpArrayController.arrangedObjects content values = PopUpArrayController.arrangedObjects.name (name is an NSString) selected object = EmployeeArrayController.selection.department.name This allows for viewing of all departments in the popup menu, correct selection of the current Employee's department, and allows that department to be changed as expected. The goal is to change this for an NSComboBox so that the user can tab to the box and type the department name in without switching to the mouse. I have tried numerous different bindings to accomplish this. I even had it work for one run with these bindings: content = PopUpArrayController.arrangedObjects.name value = EmployeeArrayController.selection.department.name At least once this worked as expected (it even added a new department when the entered text did not match any existing department). Now however it will display the available Departments and auto complete but will not update the model with the correct value when the value is changed in the combo box. If the Department is set or changed with the popup the correct department is shown in the combo box. Does anyone know what I am missing? Thanks.

  Read the article

• IIS, Web services, Time out error

  - by Eduard

  Hello, We’ve got problem with ASP.NET web application that uses web services of other system. I’ll describe our system architecture: we have web application and Windows services that uses the same web services. - Windows service works all the time and sends information to these web services once an hour. - Web application is designed for users to send the same information in manual behavior. The problem is when user sometimes tries to send information in manual behavior in the web application, .NET throws exception „The operation has timed out” (web?). At that time Windows service successfully sends all necessary information to these web services. IT stuff that supports these web services asserts that there was no any request from our web application at that time. Then we have restarted IIS (iisreset) and everything has started to work fine. This situation repeats all the time. There is no anti-virus or firewall on the server. My suggestion is that there is something wrong with IIS, patches, configuration or whatever? The only specific thing is that there are requests that can least 2 minutes (web service response wait time). We tried to reproduce this situation on our local test servers, but everything works fine. OS: Windows Server 2003 R2 .NET: 3.5

  Read the article

• Pin animatesDrop mapView-iOS

  - by user1724168

  I have implemented code as seen below. I would like to add animation with dropping effect. However, once I type pinView.animatesDrop does not recognize! I could not able to figure out what I am doing wrong? - (MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation { MKAnnotationView *pinView=nil; if(![annotation isKindOfClass:[Annotation class]]) // Don't mess user location return nil; static NSString *defaultPinID = @"StandardIdentifier"; pinView = (MKAnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID]; if (pinView == nil){ pinView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID]; } // Build our annotation if ([annotation isKindOfClass:[Annotation class]]) { Annotation *a = (Annotation *)annotation; pinView.image = [ZSPinAnnotation pinAnnotationWithColor:a.color];// ZSPinAnnotation Being Used pinView.annotation = a; pinView.enabled = YES; pinView.centerOffset=CGPointMake(6.5,-16); pinView.calloutOffset = CGPointMake(-11,0); //pinView.animatesDrop = YES; } pinView.canShowCallout = YES; UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; [rightButton setTitle:annotation.title forState:UIControlStateNormal]; [pinView setRightCalloutAccessoryView:rightButton]; pinView.leftCalloutAccessoryView = [[UIView alloc] init]; pinView.leftCalloutAccessoryView=nil; /*UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeInfoLight]; [leftButton setTitle:annotation.title forState:UIControlStateNormal]; [pinView setLeftCalloutAccessoryView:leftButton];*/ return pinView; }

  Read the article

• fixed layout in formview template

  - by Jeroen

  I have n pages with formviews, all sharing a similar layout inside their item/edit/insert templates. For example all item and edit templates have a header and body part inside where i put the fields. The header has a certain style and the body part too. My question is how can i enforce this style in all my formviews without repeating the same bulk css styles all the time. Now i'm using masterpages for this with multiple formviews on 1 page. That's not good i think. I want one 1 page for edit/insert/item and 1 formview. I would prefer somehow to define the style for edit template once and load it into every formview. Ofcourse not all the formviews have the same fields, so like masterpages i would like to have 'areas' where i can put my fields. The perfect way i suppose would be to have a formview span a complete masterpage based page including the contentplaceholders inside it's edit/insert/item templates. Any ideas are more than welcome. Edit: I read it's possible in .Net 4 using dynamic data. I'm stuck with 3.5 for the moment.

  Read the article

• Need help with animation on iPhone

  - by Arun Ravindran

  I'm working on an animated clock application for the iPhone, and I have to pivot all the 3 nodes in the view, which I have obtained in the following code: [CATransaction begin]; [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions]; clockarm.layer.anchorPoint = CGPointMake(0.0, 0.0); [CATransaction commit]; [CATransaction begin]; [CATransaction setValue:(id)kCFBooleanFalse forKey:kCATransactionDisableActions]; [CATransaction setValue:[NSNumber numberWithFloat:50.0] forKey:kCATransactionAnimationDuration]; CABasicAnimation *animation; animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; animation.fromValue = [NSNumber numberWithFloat:-60.0]; animation.toValue = [NSNumber numberWithFloat:2 * M_PI]; animation.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionLinear]; animation.delegate = self; [clockarm.layer addAnimation:animation forKey:@"rotationAnimation"]; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; [CATransaction commit]; The problem it's just rotating once, ie. only 360 degree and then stopping. I want to raotate the needles indefinitely. How would I do that?

  Read the article

• Can GWT image sprites using ImageBundle be made to work in IE7 and IE6?

  - by aem

  I'm trying to use a ClientBundle in my GWT application to make multiple images get sent as a single file. I declare the bundle like so: public interface MyResources extends ClientBundle { public static final MyResources INSTANCE = GWT.create(MyResources.class); @Source("icon1.png") ImageResource icon1(); @Source("icon2.png") ImageResource icon2(); } This works great in Firefox and IE8, but in IE7 (and earlier) the whole sprite shows up in place of one of my original images - that is, icon1 is next to icon2 next to icon3, and so on. In IE8's developer tools using IE8-as-IE7 mode or Compatibility View, I can see that it's showing an image with a file name like 26BEFD2399A92A5DDA54277BA550C75B.cache.png, which is what I'd expect. So is there any way to make GWT image sprites work in IE7 and lower? If not, is there any way to gracefully degrade so users of other browsers get the speedup of spriting and IE7 and IE6 users get something that looks right but is slower? Edit: The Client Bundle Developer's Guide has a discussion of using ClientBundle and @sprite, and says "Support for IE6 isn't feasible in this format, because structural changes to the DOM are necessary to implement a "windowing" effect. Once it's possible to distinguish ie6 and ie7 in user.agent, we could revisit support for ie6. In the current implementation, the ie6 code won't render correctly, although is a purely cosmetic issue." Is this what's going on in my case, and is there a way to work around it? Showing all the images is "purely a cosmetic issue", but it's a pretty severe one.

  Read the article

• Piloting Microsoft Word With Ole in C++ Builder : how to put Word in the foreground.

  - by Getz

  Hi! I've got a code (which works fine) for piloting word with C++ Builder. It's useful for reaching different bookmarks in the document. Variant vNom, vWDocuments, vWDocument, vMSWord, vSignets, vSignet; vNom = WideString("blabla.doc"); try { vMSWord = Variant::GetActiveObject("Word.Application"); } catch(...) { vMSWord = Variant::CreateObject("Word.Application"); } vMSWord.OlePropertySet("Visible", true); vWDocuments = vMSWord.OlePropertyGet("Documents"); vWDocument = vWDocuments.OleFunction("Open", vNom); vSignets = vWDocument.OlePropertyGet("BookMarks"); if (vSignets.OleFunction("Exists", signet)) { vSignet = vSignets.OleFunction("Item", signet); vSignet.OleFunction("Select"); } But once the document is opened, the user can no longer see when an other bookmark has been reached, since the application stays in background. Does anyone know how i can do to make Word displayed in the foreground, or to light-up the document in the taskbar? Thanks!

  Read the article

• Sync Vs. Async Sockets Performance in .NET

  - by Michael Covelli

  Everything that I read about sockets in .NET says that the asynchronous pattern gives better performance (especially with the new SocketAsyncEventArgs which saves on the allocation). I think this makes sense if we're talking about a server with many client connections where its not possible to allocate one thread per connection. Then I can see the advantage of using the ThreadPool threads and getting async callbacks on them. But in my app, I'm the client and I just need to listen to one server sending market tick data over one tcp connection. Right now, I create a single thread, set the priority to Highest, and call Socket.Receive() with it. My thread blocks on this call and wakes up once new data arrives. If I were to switch this to an async pattern so that I get a callback when there's new data, I see two issues The threadpool threads will have default priority so it seems they will be strictly worse than my own thread which has Highest priority. I'll still have to send everything through a single thread at some point. Say that I get N callbacks at almost the same time on N different threadpool threads notifying me that there's new data. The N byte arrays that they deliver can't be processed on the threadpool threads because there's no guarantee that they represent N unique market data messages because TCP is stream based. I'll have to lock and put the bytes into an array anyway and signal some other thread that can process what's in the array. So I'm not sure what having N threadpool threads is buying me. Am I thinking about this wrong? Is there a reason to use the Async patter in my specific case of one client connected to one server?

  Read the article

• how to fix gateway timeout error in php???

  - by developer

  Iam having a php file that sends text messages on mobile to all the users that i have in my database's particular table. Now the entries are like 2000 or so in number and this number will keep on increasing. On my page there is a small form that selects a list of the users to whom message is to be sent from a drop down and then user writes the text to be sent in a textarea and then on clicking the submit button php script stars sending the messages to mobile numbers. Now while trying to send messages my browser has shown gateway timeout error but the script kept on running and messages are sent to the mobiles but not once but 6 times. I checked my script my query and all the code is correct.This all happened coz of that gateway timeout. Now does this gateway timeout kepts the script running again and again till the browser is not closed?? is this was the reason that a single message was sent 6 times to mobile numbers?? I mean how can i escape my file from getting this gateway error so that one message is sent only one time to a number??

  Read the article

• How to make NAnt send an email using a real account

  - by Turro

  First of all, I have already seen this post: nant mail issues but the only answer is not satisfactory (i.e.: doesn't work for me). I am using NAnt to get latest version of source, upgrade version of the libraries and application, build the application, build the setups... all the usual things, I bet. I would like NAnt to send an email to some people confirming the conclusion of the build process; I've already checked the official (pretty ugly, IMHO) documentation for the task, but the example, once copied and customized, doesn't work. This are the NAnt target and task I'm using: <target name="sendMail" > <mail from="[email protected]" tolist="[email protected];[email protected]" subject="Subject of email" mailhost="smtp.gmail.com" message="Your new release is ready!"> </mail> </target> The error message I get is: 530 5.7.0 Must issue a STARTTLS command first. It looks like that the task was designed for use by an account whose provider doesn't need authentication; but what can I do if I must use an external smtp server which requires authentication (telling my boss I need an smtp server in house is not an option)? Can anybody help/teach me? Thanks in advance...

  Read the article

• Exception in setDrawingCache in Android 1.5?

  - by sunil

  Hi, I am developing an application where I am using setDrawingCache and then once I get the Bitmap I destroy the cache by using destroyDrawingCache(). The application has been developed with Android SDK 1.6. When testing the application in emulator with Android 1.5 the application throws NullPointerException when try to manipulate the Bitmap returned by getDrawingCache(). It probably gives error since getDrawingCache returns null. The interesting thing in this is that the NullPointerException comes only after I run the application twice or thrice. It means I am able to get the Bitmap for two times and then it throws this exception. The error that I am getting is as below java.lang.NullPointerException E/AndroidRuntime( 1036): at com.babbleville.HomeScreenActivity.resizeBitmap(HomeScreenActivity.java: 394) E/AndroidRuntime( 1036): at com.babbleville.HomeScreenActivity.access $0(HomeScreenActivity.java:392) E/AndroidRuntime( 1036): at com.babbleville.HomeScreenActivity $1.handleMessage(HomeScreenActivity.java:327) E/AndroidRuntime( 1036): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime( 1036): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime( 1036): at android.app.ActivityThread.main(ActivityThread.java:3948) E/AndroidRuntime( 1036): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 1036): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime( 1036): at com.android.internal.os.ZygoteInit $MethodAndArgsCaller.run(ZygoteInit.java:782) E/AndroidRuntime( 1036): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) E/AndroidRuntime( 1036): at dalvik.system.NativeStart.main(Native Method) Can someone please let me know the problem? Regards Sunil

  Read the article

• NSMutableString leaks on append or replaceOccurrencesOfString

  - by John

  Hello Folks, I know similar questions have been asked time and time again but I ask that you please bear with me as I cannot seem to find an answer that helps. My application has leaks that are driving me out of my mind. Actually, they are not reported as leaks using Leaks, but my net bytes in ObjectAlloc goes up and up and up and never stops, eventually leading to a crash if it goes on long enough (not very long). The problem occurs with NSMutableStrings. I think there is either something fundamental I don't understand about them, or I am facing another problem that I am having difficulty tracking down but keeps hiding behind the NSMutableStrings. Specifically, I am noticing that whenever I append to or perform a replace on a NSMutableString, ObjectAlloc reports what appear to be mismatches in malloc/frees behind the scene when resizing the NSMutableString. I'm sorry to say this is the second time I'm facing this problem - the first time I messed around for hours and hours and finally the problem went away (magic!) but I don't really know why. When I look at the code below (and believe me, I've stared at it for hours) I cannot see the problem. I look at the code and think to myself that I should be fine because I'm releasing the only object for which I am responsible (aString) and that NSMutableString should be taking care of cleaning up after any resizing it does. In the second example, just so you know in case it helps, the string being passed in comes from an ASIHTTPRequest object (it's the responseString) and I don't do anything at all with it. It's being called simply like so ([self DoStuff2:[request responseString]]) and I don't free the request myself either (I'm using a ASINetworkQueue and I assume that the requests are destroyed for me (I tried and caused errors because the request was already being release somewhere else). Also, I know it shouldn't do anything, but I even tried wrapping the code in autorelease pools, which of course did nothing. I should mention that this code is being run inside of an NSOperation. I thought that perhaps I am experiencing problems because NSOperations should create an autorelease pool for themselves, but I've tried that to no avail. Not related to NSMutableString, but I find I also have similar problems using the NSString componentsSeparatedByString method. Sometimes the memory used by the array that gets the separated components is never released. Hmmm...strings in general seem to be somewhat problematic for me it seems. I would appreciate ANY help anyone can provide. If you require more info, I'll be glad to add it. I do promise you that I've struggled with this (and other problems) for weeks and every problem I encounter I research hard and long until I find a solution - this is not an idle request, but a true cry for help! I've written so much code and now I'm trying to seal some small leaks etc and I notice this problem. Honestly, I cannot believe how memory management in Objective C can stump me so at times...I've read Apple's memory mgmt docs many times and I thought I thoroughly understood it and I try to be diligent about releasing objects I own, but sometimes I find myself wondering if I truly understand...I would like to put this to bed once and make sure I understand all this fully - to have this sort of question/problem after writing thousands of lines of code is more than a little scary/embarrassing/annoying. So again, if anybody has any insight, I'd be grateful. Thanks for your time and efforts. -(void)DoStuff { NSString *aString [ [[NSString alloc] initWithFormat:@"text %@ more text", self.strVariable]; [self.someMutableStringVar replaceOccurrencesOfString:@"replace" withString:aString options:NSCaseInsensitiveSearch range:NSMakeRange(0, [self.someMutableStringVar length])]; [aString release]; } -(void)DoStuff2:(NSString *)aString { [self.someMutableStringVar appendString:aString]; }

  Read the article

• Evolutionary Algorithms: Optimal Repopulation Breakdowns

  - by Brian MacKay

  It's really all in the title, but here's a breakdown for anyone who is interested in Evolutionary Algorithms: In an EA, the basic premise is that you randomly generate a certain number of organisms (which are really just sets of parameters), run them against a problem, and then let the top performers survive. You then repopulate with a combination of crossbreeds of the survivors, mutations of the survivors, and also a certain number of new random organisms. Do that several thousand times, and efficient organisms arise. Some people also do things like introduce multiple "islands" of organisms, which are seperate populations that are allowed to crossbreed once in awhile. So, my question is: what are the optimal repopulation percentages? I have been keeping the top 10% performers, and repopulating with 30% crossbreeds and 30% mutations. The remaining 30% is for new organisms. I have also tried out the multiple island theory, and I'm interested in your results on that as well. It is not lost on me that this is exactly the type of problem an EA could solve. Are you aware of anyone trying that? Thanks in advance!

  Read the article

• Matplotlib canvas drawing

  - by Morgoth

  Let's say I define a few functions to do certain matplotlib actions, such as def dostuff(ax): ax.scatter([0.],[0.]) Now if I launch ipython, I can load these functions and start a new figure: In [1]: import matplotlib.pyplot as mpl In [2]: fig = mpl.figure() In [3]: ax = fig.add_subplot(1,1,1) In [4]: run functions # run the file with the above defined function If I now call dostuff, then the figure does not refresh: In [6]: dostuff(ax) I have to then explicitly run: In [7]: fig.canvas.draw() To get the canvas to draw. Now I can modify dostuff to be def dostuff(ax): ax.scatter([0.],[0.]) ax.get_figure().canvas.draw() This re-draws the canvas automatically. But now, say that I have the following code: def dostuff1(ax): ax.scatter([0.],[0.]) ax.get_figure().canvas.draw() def dostuff2(ax): ax.scatter([1.],[1.]) ax.get_figure().canvas.draw() def doboth(ax): dostuff1(ax) dostuff2(ax) ax.get_figure().canvas.draw() I can call each of these functions, and the canvas will be redrawn, but in the case of doboth(), it will get redrawn multiple times. My question is: how could I code this, such that the canvas.draw() only gets called once? In the above example it won't change much, but in more complex cases with tens of functions that can be called individually or grouped, the repeated drawing is much more obvious, and it would be nice to be able to avoid it. I thought of using decorators, but it doesn't look as though it would be simple. Any ideas?

  Read the article

• How to catch a division by zero?

  - by Cristian Castiblanco

  I have a large mathematical expression that has to be created dinamically. So, for example, once I have parsed "something" the result will be a string like: "$foo+$bar/$baz";. So, for calculating the result of that expression I'm using the eval function... something like this: eval("\$result = $expresion;"); echo "The result is: $result"; The problem here is that sometimes I get errors that says there was a division by zero, and I don't know how to catch that Exception. I have tried things like: eval("try{\$result = $expresion;}catch(Exception \$e){\$result = 0;}"); echo "The result is: $result"; Or: try{ eval("\$result = $expresion;"); } catch(Exception $e){ $result = 0; } echo "The result is: $result"; But it does not work. So, how can I avoid that my application crashes when there is a division by zero?

  Read the article

• Adding functionality to any TextReader

  - by strager

  I have a Location class which represents a location somewhere in a stream. (The class isn't coupled to any specific stream.) The location information will be used to match tokens to location in the input in my parser, to allow for nicer error reporting to the user. I want to add location tracking to a TextReader instance. This way, while reading tokens, I can grab the location (which is updated by the TextReader as data is read) and give it to the token during the tokenization process. I am looking for a good approach on accomplishing this goal. I have come up with several designs. Manual location tracking Every time I need to read from the TextReader, I call AdvanceString on the Location object of the tokenizer with the data read. Advantages Very simple. No class bloat. No need to rewrite the TextReader methods. Disadvantages Couples location tracking logic to tokenization process. Easy to forget to track something (though unit testing helps with this). Bloats existing code. Plain TextReader wrapper Create a LocatedTextReaderWrapper class which surrounds each method call, tracking a Location property. Example: public class LocatedTextReaderWrapper : TextReader { private TextReader source; public Location Location { get; set; } public LocatedTextReaderWrapper(TextReader source) : this(source, new Location()) { } public LocatedTextReaderWrapper(TextReader source, Location location) { this.Location = location; this.source = source; } public override int Read(char[] buffer, int index, int count) { int ret = this.source.Read(buffer, index, count); if(ret >= 0) { this.location.AdvanceString(string.Concat(buffer.Skip(index).Take(count))); } return ret; } // etc. } Advantages Tokenization doesn't know about Location tracking. Disadvantages User needs to create and dispose a LocatedTextReaderWrapper instance, in addition to their TextReader instance. Doesn't allow different types of tracking or different location trackers to be added without layers of wrappers. Event-based TextReader wrapper Like LocatedTextReaderWrapper, but decouples it from the Location object raising an event whenever data is read. Advantages Can be reused for other types of tracking. Tokenization doesn't know about Location tracking or other tracking. Can have multiple, independent Location objects (or other methods of tracking) tracking at once. Disadvantages Requires boilerplate code to enable location tracking. User needs to create and dispose the wrapper instance, in addition to their TextReader instance. Aspect-orientated approach Use AOP to perform like the event-based wrapper approach. Advantages Can be reused for other types of tracking. Tokenization doesn't know about Location tracking or other tracking. No need to rewrite the TextReader methods. Disadvantages Requires external dependencies, which I want to avoid. I am looking for the best approach in my situation. I would like to: Not bloat the tokenizer methods with location tracking. Not require heavy initialization in user code. Not have any/much boilerplate/duplicated code. (Perhaps) not couple the TextReader with the Location class. Any insight into this problem and possible solutions or adjustments are welcome. Thanks! (For those who want a specific question: What is the best way to wrap the functionality of a TextReader?) I have implemented the "Plain TextReader wrapper" and "Event-based TextReader wrapper" approaches and am displeased with both, for reasons mentioned in their disadvantages.

  Read the article

• How do I get netcat to accept connections from outside the LAN?

  - by Chris

  I'm using netcat as a backend to shovel data back and forth for a program I'm making. I tested my program on the local network, and once it worked I thought it would be a matter of simply forwarding a port from my router to have my program work over the internet. Alas! This seems not to be the case. If I start netcat listening on port 6666 with: nc -vv -l -p 6666, then go to 127.0.0.1:6666 in a browser, as expected I see a HTTP GET request come through netcat (and my browser sits waiting in vain). If I go to my.external.ip.address:6666, however, nothing comes through at all and the browser displays 'could not connect to my.external.ip.address:6666'. I know that the port is correctly forwarded, as www.canyouseeme.org says port 6666 is open (and when netcat is not listening, that its closed). If I run netcat with -g my.adslmodem's.local.address to set the gateway address, I get the same behavior. Am I using this command line option correctly? Any insight as to what I'm doing wrong?

  Read the article

• django shopping cart as a beginner

  - by Jacques Knie

  Hi, i'm quite new to django and trying to add a shopping cart to a simple webshop. What I need is a simple cart that can be filled and presents its content, which is then sent to the vendor via email. So Satchmo might be too big for this task. Therefore i chose django-cart (http://code.google.com/p/django-cart/) which causes some problems now. 1. Is django-cart the right thing? Or are there any better approaches to this task? 2. As I am a beginner even django-cart makes me struggle. I used the view and the template of the django-cart-website, but writing a form that can be used to add products to the cart took me hours. I probably need help in understanding the general layout of a shopping cart and its integration into a website. 3. Two more specific questions: Is it possible to dynamically populate a formfield in a template (e.g. with {{ object.id }})? Is django-cart able to change (update) the contents of a cart? I hope it's not too many questions at once. Thanks in advance Jacques

  Read the article

• SSIS Lookup with Lookup Component Vs Script Component.

  - by Nev_Rahd

  Hello, I need to load Dimensions from EDW Tables (which does maintain historical records) and is of type Key-Value-Parameter. My scenario is ok if got a record in EDW as below Key1 Key2 Code Value EffectiveDate EndDate CurrentFlag 100 555 01 AAA 2010-01-01 11.00.00 9999-12-31 Y 100 555 02 BBB 2010-01-01 11.00.00 9999-12-31 Y This need to be loaded into DM by pivoting it as key1 and key2 combinations makes Natural key for DM SK NK 01 02 EffectiveDate EndDate CurrentFlag 1 100-555 AAA BBB 2010-01-01 11.00.00 9999-12-31 Y My ssis package does this all good pivoting... looking up the incoming NK in DIM.. if new will insert .. else with further lookup with effective date and determine if the incoming for same natural key got any new (change) in attribute.. if so updates the current record byy setting its end date and insert the new one with new attribute value and pulling the recent records values for other attributes. My problem is if the same natural key comes twice with same attribute in single extract my first lookup which on natural key .. will let both records pass and try to insert.. where its fails. If i get distinct records on NK the second is not picked and need to run package again. So my question how can i configure lookup or alernative way to handle this scenario when same NK comes twice in single extract, would be able to insert first record if not exists in Dim table and for second one should be able to updated with the changes with reference to one inserted above. Not sure this makes sense what am trying to explain. Will attached the screenshot once back to work desk (on monday). Thanks

  Read the article

• visual studio 2008 vs 2010 Pro unmanaged code

  - by bartek

  Hi, I'm a C++ programmer, I use Visual Studio 2008 Professional, only unmanaged code. I'm thinking of buying VS 2010 Pro. I'm confused, I don't know what are differences between those two. I know that, in plus, it has tr1 included. When I started using 2008 edition I was very pleased to see f.e. unit testing support but all new features are only for managed code. The C++ debugger in 2008 is very good, better than 2003 edition one. I would't like to buy a new tool and discover that I gained nothing and lost some functionality ( because f.e. something was moved to higher version). Once upon a time I switched from very good VS6 to VS 2003.Net and imagine what, after some time I discovered that Pro has no support for code optimalization. It is wonderful how Microsoft makes money. I wouldn't like to experience something like that again. What do you think, what can you recommended?

  Read the article

• Templates vs. coded HTML

  - by Alan Harris-Reid

  I have a web-app consisting of some html forms for maintaining some tables (SQlite, with CherryPy for web-server stuff). First I did it entirely 'the Python way', and generated html strings via. code, with common headers, footers, etc. defined as functions in a separate module. I also like the idea of templates, so I tried Jinja2, which I find quite developer-friendly. In the beginning I thought templates were the way to go, but that was when pages were simple. Once .css and .js files were introduced (not necessarily in the same folder as the .html files), and an ever-increasing number of {{...}} variables and {%...%} commands were introduced, things started getting messy at design-time, even though they looked great at run-time. Things got even more difficult when I needed additional javascript in the or sections. As far as I can see, the main advantages of using templates are: Non-dynamic elements of page can easily be viewed in browser during design. Except for {} placeholders, html is kept separate from python code. If your company has a web-page designer, they can still design without knowing Python. while some disadvantages are: {{}} delimiters visible when viewed at design-time in browser Associated .css and .js files have to be in same folder to see effects in browser at design-time. Data, variables, lists, etc., must be prepared in advanced and either declared globally or passed as parameters to render() function. So - when to use 'hard-coded' HTML, and when to use templates? I am not sure of the best way to go, so I would be interested to hear other developers' views. TIA, Alan

  Read the article

< Previous Page | 676 677 678 679 680 681 682 683 684 685 686 687  | Next Page >