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• Representing Sparse Data in PostgreSQL

  - by Chris S

  What's the best way to represent a sparse data matrix in PostgreSQL? The two obvious methods I see are: Store data in a single a table with a separate column for every conceivable feature (potentially millions), but with a default value of NULL for unused features. This is conceptually very simple, but I know that with most RDMS implementations, that this is typically very inefficient, since the NULL values ususually takes up some space. However, I read an article (can't find its link unfortunately) that claimed PG doesn't take up data for NULL values, making it better suited for storing sparse data. Create separate "row" and "column" tables, as well as an intermediate table to link them and store the value for the column at that row. I believe this is the more traditional RDMS solution, but there's more complexity and overhead associated with it. I also found PostgreDynamic, which claims to better support sparse data, but I don't want to switch my entire database server to a PG fork just for this feature. Are there any other solutions? Which one should I use?

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• Effective Android Programming Techniques

  - by kunjaan

  Please Help me compile a list of Effective Android Programming techniques Don't forget to free resources after use. Lot of resources like Cursors are overlooked. Free them too. Don't Use magic Numbers. values[0] is meaningless. The framework provides very useful accessors like values[SensorManager.DATA_X] "Make use of onPause()/onResume to save or close what does not need to be opened the whole time." protected void onResume() { mSensorManager.registerListener(...); } protected void onStop() { mSensorManager.unregisterListener(...); super.onStop(); } Make your Android UI Fast and Efficient from the Google I/O has a lot of useful UI Performance tips.

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• NSScanner scanFloat returning unexpected results

  - by E-Madd

  I'm trying to build a UIColor from a comma-delimited list of values for RGB, which is "0.45,0.53,0.65", represented here by the colorConfig object... NSScanner *scanner = [NSScanner scannerWithString:colorConfig]; [scanner setCharactersToBeSkipped:[NSCharacterSet characterSetWithCharactersInString:@"\n, "]]; float red, green, blue; return [UIColor colorWithRed:[scanner scanFloat:&red] green:[scanner scanFloat:&green] blue:[scanner scanFloat:&blue] alpha:1]; But my color is always coming back as black. So I logged the values to my console and I'm seeing Red = -1.988804, Green = -1.988800, Blue = -1.988796 What am I doing wrong?

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• Not Getting Profile properties in Code Behind.

  - by user228777

  I am trying to get Profile properties in the code behind. But I am not getting any intellisence like Profile.Homephone or Profile.CellPhone. When I try Dim memberprofile As ProfileBase = HttpContext.Current.Profile Dim homePhone As String = memberprofile.GetPropertyValue("HomePhone").ToString() I get Data is Null. This method or property cannot be called on Null values error. I have data for current user in the profile Table. I get following results in immediate window ?HttpContext.Current.Profile.UserName.ToString "sub2" ?Profile.DefaultProfile.Properties.Count 2 ? HttpContext.Current.Profile("HomePhone") "" {String} String: "" I am not able to run property values in page load event. This is my web.config file setting.

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• Is there a way to handle the dynamic change of a dropdown for a single row in a grid-based datawindo

  - by TomatoSandwich

  Is there a way to handle the dynamic change of a dropdown for a single row in a grid-based datawindow? Example: NAME LIKABILITY PURCHASED IN COLOUR (Text) (DropDown*) (Text) (Text) Bananas [Good] Hands Yellow [Bad] [Bananas are good] Apples [Good] Bags Red [Bad] Given the above is a grid-based datawindow, where the fields 'NAME','PURCHASED IN' and 'COLOUR' are text fields, where as the 'LIKABILITY' field is a dropdown*. I say dropdown* because the same visual representation can be created by using a DropDownList (hardcoded within the datawindow element at design time), or a DropDownDW (or DDDW, a select statement that can be based on other elements in the datawindow). However, there is no way I can get 'Bananas' having it's 3 dropdowns, while Apples has only 2. If I enter multiple rows of 'Bananas', then all rows have 3 dropdowns, but as soon as I add an Apples row, all dropdowns revert to 2 selections. To attempt to achieve this functionality, I have tried the following options: -- 1) dw_1.Object.likability.values("Good~tG/Bad~tB/Bananas are good~tDRWHO") on ue_itemchange when editing NAME. FAILS: edits all instances of LIKABILITY instead of the current row. -- 2) Duplicate Dropdowns, having one filtered, one unfiltered selection list per row, visible based on NAME selection. FAILS: can't set visibility/overlapping columns on grid-based datawindow. (Source) -- 3) Hard-code display value as Database value, or Vice Versa. Have 'GOOD','BAD','BANANASAREGOOD' as the display and database values, and change handling of options from G, B, DRWHO to these new values. FAILS: 3rd option appears for all rows, still selectable on Apple rows, which is wrong. -- 4) DDDW retrieve list of options for dropdown. Create a DDDW that uses the value of NAME to determine what selections it should have for the dropdown. FAILS: edits all instances of the dropdown, not just the current row. -- 5) DDDW retrieve counter of options available (if B then 3 else 2), then have duplicate dropdown columns that protect/unprotect based on DDDW counter. FAILS: Can't autoselect dddw value to populate column to cause protect on other two columns, ugly solution in any case. -- There is now a bounty on this question for anyone who can give me a solution that will enable me to edit a dropdown column for a single row on a grid-based datawindow in PB 10.5

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• Comparing 2 columns in the same table with the "Like" function

  - by Vic

  I'm trying to come up with a way to query the values in two different columns in the same table where the result set will indicate instances where the value of columnB doesn't contain the value of columnA. For example, my "Nodes" table contains columns "NodeName" and "DNS". The values should look similar to the following: NodeName DNS Router1 Router1.mydomain.com I want to run a query to show which rows have a DNS value that does not contain (or begin with) the value of the NodeName field. I think the query should function something similar to the following, but obviously I'm missing something with regard to the use of "Like" in this situation. SELECT NodeName, DNS WHERE DNS NOT LIKE 'NodeName%' I'm using SQL Server 2005, and any suggestions would be greatly appreciated... :)

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• Subsetting a data frame in a function using another data frame as parameter

  - by lecodesportif

  I would like to submit a data frame to a function and use it to subset another data frame. This is the basic data frame: foo <- data.frame(var1= c('1', '1', '1', '2', '2', '3'), var2=c('A', 'A', 'B', 'B', 'C', 'C')) I use the following function to find out the frequencies of var2 for specified values of var1. foobar <- function(x, y, z){ a <- subset(x, (x$var1 == y)) b <- subset(a, (a$var2 == z)) n=nrow(b) return(n) } Examples: foobar(foo, 1, "A") # returns 2 foobar(foo, 1, "B") # returns 1 foobar(foo, 3, "C") # returns 1 This works. But now I want to submit a data frame of values to foobar. Instead of the above examples, I would like to submit df to foobar and get the same results as above (2, 1, 1) df <- data.frame(var1=c('1','1','3'), var2=c("A", "B", "C")) When I change foobar to accept two arguments like foobar(foo, df) and use y[, c(var1)] and y[, c(var2)] instead of the two parameters x and y it still doesn't work. Which way is there to do this?

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• Regular Expressions: RegEx for determining valid PHP class property names?

  - by Brian Lacy

  I am using PHP's magic __set and __get methods to access a private array in a class. I want to make sure the property names requested (i.e. $myObj->FakeProperty) are valid according to PHP property name rules before accessing them. My current RegEx isn't doing the trick; with my test values, _12 always falls through the cracks. I'm not actually sure that my test values even represent a realistic representation of what is and isn't allowed for PHP class property names, but I'm not really too concerned about it, just that I have some sort of rudimentary check in place. Test Fields: albert12 12Albert _12 _Albert12 _12Albert _____a_1 RegEx: ^(?=_*[A-z]+)[A-z0-9_]+$

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• How to give you website customers a secure feeling

  - by Saif Bechan

  I was wondering how you can give your website customers the confidence that you are not tinkering with the database values. I am planning on running a website which falls in the realm of an online game. There is some kind of credit system involved that people have to pay for. Now I was wondering how sites like this ensure there customers that there is no foul play in the database itself. As I am the database admin i can pretty much change all the values from within without anyone knowing i did. Hence letting someone win that does not rightfully is the winner. Is it maybe an option to decrypt en encrypt the credits people have so i can't change them. Or is there maybe a company i can hire that checks my company for foul play.

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• How to Retrive data from XML Using XMLReader in C#

  - by Suryakavitha

  Hi, I am using windows application and i have four combo boxes(comboeventname,combosendtype,comboType,comboschedule) in that form.... I have stored that combo values in to XML file by using XML writer... now i want to display tha datas in that combo boxes in form load event when form opns in run time... How to retrive that values from that XML file and how to display that datas in combo boxes while run time... How shall i do this? Anyone tell me the solution of this..... Thanks in Advance...

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• PHP JSON encode output number as string

  - by mitch

  I am trying to output a JSON string using PHP and MySQL but the latitude and longitude is outputting as a string with quotes around the values. This causes an issue when I am trying to add the markers to a google map. Here is my code: $sql = mysql_query('SELECT * FROM markers WHERE address !=""'); $results = array(); while($row = mysql_fetch_array($sql)) { $results[] = array( 'latitude' =>$row['lat'], 'longitude' => $row['lng'], 'address' => $row['address'], 'project_ID' => $row['project_ID'], 'marker_id' => $row['marker_id'] ); } $json = json_encode($results); echo "{\"markers\":"; echo $json; echo "}"; Here is the expected output: {"markers":[{"latitude":0.000000,"longitude":0.000000,"address":"2234 2nd Ave, Seattle, WA","project_ID":"7","marker_id":"21"}]} Here is the output that I am getting: {"markers":[{"latitude":"0.000000","longitude":"0.000000","address":"2234 2nd Ave, Seattle, WA","project_ID":"7","marker_id":"21"}]} Notice the quotes around the latitude and longitude values.

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• Using ViewModel Pattern with MVC 2 Strongly Typed HTML Helpers

  - by Brettski

  I am working with ASP.NET MVC2 RC and can't figure out how to get the HTML helper, TextBoxfor to work with a ViewModel pattern. When used on an edit page the data is not saved when UpdateModel() is called in the controller. I have taken the following code examples from the NerdDinner application. Edit.aspx <%@ Language="C#" Inherits="System.Web.Mvc.ViewUserControl<NerdDinner.Models.DinnerFormViewModel>" %> ... <p> // This works when saving in controller (MVC 1) <label for="Title">Dinner Title:</label> <%= Html.TextBox("Title", Model.Dinner.Title) %> <%= Html.ValidationMessage("Title", "*") %> </p> <p> // This does not work when saving in the controller (MVC 2) <label for="Title">Dinner Title:</label> <%= Html.TextBoxFor(model => model.Dinner.Title) %> <%= Html.ValidationMessageFor(model=> model.Dinner.Title) %> </p> DinnerController // POST: /Dinners/Edit/5 [HttpPost, Authorize] public ActionResult Edit(int id, FormCollection collection) { Dinner dinner = dinnerRepository.GetDinner(id); if (!dinner.IsHostedBy(User.Identity.Name)) return View("InvalidOwner"); try { UpdateModel(dinner); dinnerRepository.Save(); return RedirectToAction("Details", new { id=dinner.DinnerID }); } catch { ModelState.AddModelErrors(dinner.GetRuleViolations()); return View(new DinnerFormViewModel(dinner)); } } When the original helper style is used (Http.TextBox) the UpdateModel(dinner) call works as expected and the new values are saved. When the new (MVC2) helper style is used (Http.TextBoxFor) the UpdateModel(dinner) call does not update the values. Yes, the current values are loaded into the edit page on load. Is there something else which I need to add to the controller code for it to work? The new helper works fine if I am just using a model and not a ViewModel pattern. Thank you.

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• Help Understanding Function

  - by Fred F.

  What does the following function perform? public static double CleanAngle(double angle) { while (angle < 0) angle += 2 * System.Math.PI; while (angle > 2 * System.Math.PI) angle -= 2 * System.Math.PI; return angle; } This is how it is used with ATan2. I believe the actually values passed to ATan2 are always positive. static void Main(string[] args) { int q = 1; //'x- and y-coordinates will always be positive values //'therefore, do i need to "clean"? foreach (Point oPoint in new Point[] { new Point(8,20), new Point(-8,20), new Point(8,-20), new Point(-8,-20)}) { Debug.WriteLine(Math.Atan2(oPoint.Y, oPoint.X), "unclean " + q.ToString()); Debug.WriteLine(CleanAngle(Math.Atan2(oPoint.Y, oPoint.X)), "cleaned " + q.ToString()); q++; } //'output //'unclean 1: 1.19028994968253 //'cleaned 1: 1.19028994968253 //'unclean 2: 1.95130270390726 //'cleaned 2: 1.95130270390726 //'unclean 3: -1.19028994968253 //'cleaned 3: 5.09289535749705 //'unclean 4: -1.95130270390726 //'cleaned 4: 4.33188260327232 }

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• Issue with python string join.

  - by Pradyot

  I have some code in which I apply a join to a list. The list before the join looks like this: ["'DealerwebAgcy_NYK_GW_UAT'", "'DealerwebAgcy'", "'UAT'", '@ECNPhysicalMarketCo nfigId', "'GATEWAY'", "'DEALERWEB_MD_AGCY'", "'NU1MKVETC'", "'mkvetcu'", "'C:\te mp'", '0', "'NYK'", '0', '1', "'isqlw.exe'", 'GetDate()', '12345', "'NYK'", '350 ', '7'] After the join this is the resulting string 'DealerwebAgcy_NYK_GW_UAT','DealerwebAgcy','UAT',@ECNPhysicalMarketConfigId,'GAT EWAY','DEALERWEB_MD_AGCY','NU1MKVETC','mkvetcu','C: emp',0,'NYK',0,1,'isqlw. exe',GetDate(),12345,'NYK',350,7 Note the element "'C:\temp'" which ends up as ,'C: emp', I tried something similar on the python command prompt , but I wasn't able to 2 repeat this. the relevant code responsible for this magic is as follows. values_dict["ECNMarketInstance"] = [strVal(self.EcnInstance_),strVal (self.DisplayName_) ,strVal(self.environment_), '@ECNPhysicalMarketConfigId', strVal(self.EcnGatewaTypeId_),strVal(self.ConnectionComponent_) ,strVal(self.UserName_),strVal(self.Password_),strVal(self.WorkingDir_),"0",strVal(self.region_),"0","1", strVal(self.LUVersion_), "GetDate()" , self.LUUserId_ ,strVal(self.LUOwningSite_),self.QuoteColumnId_ , self.Capabilities_] delim = "," joined = delim.join(values) print values print joined

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• Parsing XML with VB.net.

  - by SuperFurryToad

  I'm trying to make sense of a big data dump of XML that I need to write to a database using some VB.net code. I'm looking for some help getting started with the parsing code, specifically how to access the attribute values. <Product ID="523233" UserTypeID="Property" ParentID="523232"> <Name>My Property Name</Name> <AssetCrossReference AssetID="173501" Type=" Non Print old"> </AssetCrossReference> <AssetCrossReference AssetID="554740" Type=" Non Print old"> </AssetCrossReference> <AssetCrossReference AssetID="566495" Type=" Non Print old"> </AssetCrossReference> <AssetCrossReference AssetID="553014" Type="Non Print"> </AssetCrossReference> <AssetCrossReference AssetID="553015" Type="Non Print"> </AssetCrossReference> <AssetCrossReference AssetID="553016" Type="Non Print"> </AssetCrossReference> <AssetCrossReference AssetID="553017" Type="Non Print"> </AssetCrossReference> <AssetCrossReference AssetID="553018" Type="Non Print"> </AssetCrossReference> <Values> <Value AttributeID="5115">Section of main pool</Value> <Value AttributeID="5137">114 apartments, four floors, no lifts</Value> <Value AttributeID="5170">Property location</Value> <Value AttributeID="5164">2 key</Value> <Value AttributeID="5134">A comfortable property, the apartment is set on a pine-covered hillside - a scenic and peaceful location.</Value> <Value AttributeID="5200">YYY</Value> <Value AttributeID="5148">facilities include X,Y,Z</Value> <Value AttributeID="5067">Self Catering. </Value> <Value AttributeID="5221">Frequent organised daytime activities</Value> </Values> </Product> </Product> Thanks in advance for your help.

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• IIS7 + ASP.NET MVC Client Caching Headers Not Working

  - by Tobin Harris

  Hey folks I've deployed an ASP.NET MVC app on IIS7 and Windows Server 2008. I've read posts on here, and around the web, but can't get the darn client-side caching to work. I'm trying to cache everything in the /Content folder. So far I've select that folder in IIS manager, and set the appropriate HTTP Response Headers (under Common Headers). I've also checked the web.config file in the /Content folder and the values there are being set. All resources in /Content come back with this (from FireBug): Cache-Control no-cache, no-store, must-revalidate Pragma no-cache Content-Type image/png Expires -1 Last-Modified Sun, 11 Oct 2009 19:01:40 GMT Accept-Ranges bytes Etag "f318d643a54aca1:0" Server Microsoft-IIS/7.0 X-Powered-By ASP.NET Date Sun, 11 Oct 2009 20:40:01 GMT Content-Length 620 Note the Cache-Control and Expires values for this static image being requested. The site is currently compiled in Debug (this will change), but surely that wouldn't make a difference? Obviously I'm overlooking something, any ideas would be appreciated. Thanks

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• Can Microsoft store three-valued fields in a single bit?

  - by fenomas

  I'm completely ignorant of SQL/databases, but I was chatting with a friend who does a lot of database work about how some databases use a "boolean" field that can take a value of NULL in addition to true and false. Regarding this, he made a comment along these lines: "To Microsoft's credit, they have never referred to that kind of field as a boolean, they just call it a bit. And it's a true bit - if you have eight or fewer bit fields in a record, it only requires one byte to store them all." Naturally that seems impossible to me - if the field can hold three values you're not going to fit eight of them into a byte. My friend agreed that it seemed odd, but begged ignorance of the low-level internals and said that so far as he knew, such fields can hold three values when viewed from the SQL side, and it does work out to require a byte of storage. I imagine one of us has a wire crossed. Can anyone explain what's really going on here?

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• ClickOnce: How do I pass a querystring value to my app *through the installer*?

  - by Timothy Khouri

  My company currently builds separate MSI's for all of our clients, even though the app is 100% the same across the board (with a single exception, an ID in the app.config). I would like to show them that we can publish in once place with ClickOnce, and simply add a query string parameter for each client's installer. Example: http://mysite.com/setup.exe?ID=1234-56-7890 The issue that I'm having is that the above ("ID=1234...") is not being passed along to the "myapplication.application". What is happening instead is, the app is being installed successfully, and it is running the first time with an activation context, but the "ActivationUri" does not contain any query string values. Is there a way to pass query string values FROM THE INSTALLER URL to the application's launch URL? If so, how?

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• How do I set the next available custom color in the ColorDialog?

  - by Hannah

  I'm currently coding in VB.net. A user places the cursor in a table cell and clicks on "Table Background Color" to edit the current background colour. Currently I have been able to detect the current colour (for instance a light blue) and set that colour in the ColorDialog (Colour swatches are correct and RGB values are correct). What I would like to do is enable the user to click on the "Add to Custom Colors" to save the colour. Problem is, it sets the first square in the custom colours area (which happens to already be filled in with another custom colour), rather than finding the next square that is white and set it there instead. Is this possible? If the user selects a new custom colour square when they first load the ColorDialog, the current colour (light blue) disappears and the colour swatches and RGB values are set as white. Thanks

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• How do you link to an action that takes an array as a parameter (RedirectToAction and/or ActionLink)

  - by Andrew

  I have an action defined like so: public ActionResult Foo(int[] bar) { ... } Url's like this will work as expected: .../Controller/Foo?bar=1&bar=3&bar=5 I have another action that does some work and then redirects to the Foo action above for some computed values of bar. Is there a simple way of specifying the route values with RedirectToAction or ActionLink so that the url's get generated like the above example? These don't seem to work: return RedirectToAction("Foo", new { bar = new[] { 1, 3, 5 } }); return RedirectToAction("Foo", new[] { 1, 3, 5 }); <%= Html.ActionLink("Foo", "Foo", new { bar = new[] { 1, 3, 5 } }) %> <%= Html.ActionLink("Foo", "Foo", new[] { 1, 3, 5 }) %> However, for a single item in the array, these do work: return RedirectToAction("Foo", new { bar = 1 }); <%= Html.ActionLink("Foo", "Foo", new { bar = 1 }) %> When setting bar to an array, it redirects to the following: .../Controller/Foo?a=System.Int32[] Finally, this is with ASP.NET MVC 2 RC. Thanks.

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• Algorithm to determine coin combinations

  - by A.J.

  I was recently faced with a prompt for a programming algorithm that I had no idea what to do for. I've never really written an algorithm before, so I'm kind of a newb at this. The problem said to write a program to determine all of the possible coin combinations for a cashier to give back as change based on coin values and number of coins. For example, there could be a currency with 4 coins: a 2 cent, 6 cent, 10 cent and 15 cent coins. How many combinations of this that equal 50 cents are there? The language I'm using is C++, although that doesn't really matter too much. edit: This is a more specific programming question, but how would I analyze a string in C++ to get the coin values? They were given in a text document like 4 2 6 10 15 50 (where the numbers in this case correspond to the example I gave)

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• linq-to-sql combine .any expression

  - by Victor

  I need to filter out parent by property value of child collection. I am doing something like this: var results = (from c in db.Customers where c.Orders.Any(o => o.Status = (int)Status.Ordered) select c; It's fine but now I need to filter by 2 values, i.e. take all parent records that have any chilren records that have BOTH values: var results = (from c in db.Customers where c.Orders.Any(o => o.Status == (int)Status.Ordered) && (o.Status == (int).Shipped)) select c; Trying something obvious like this doesn't work.

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• Stack and queue operations on the same array.

  - by Passonate Learner

  Hi. I've been thinking about a program logic, but I cannot draw a conclusion to my problem. Here, I've implemented stack and queue operations to a fixed array. int A[1000]; int size=1000; int top; int front; int rear; bool StackIsEmpty() { return (top==0); } bool StackPush( int x ) { if ( top >= size ) return false; A[top++] = x; return true; } int StackTop( ) { return A[top-1]; } bool StackPop() { if ( top <= 0 ) return false; A[--top] = 0; return true; } bool QueueIsEmpty() { return (front==rear); } bool QueuePush( int x ) { if ( rear >= size ) return false; A[rear++] = x; return true; } int QueueFront( ) { return A[front]; } bool QueuePop() { if ( front >= rear ) return false; A[front++] = 0; return true; } It is presumed(or obvious) that the bottom of the stack and the front of the queue is pointing at the same location, and vice versa(top of the stack points the same location as rear of the queue). For example, integer 1 and 2 is inside an array in order of writing. And if I call StackPop(), the integer 2 will be popped out, and if I call QueuePop(), the integer 1 will be popped out. My problem is that I don't know what happens if I do both stack and queue operations on the same array. The example above is easy to work out, because there are only two values involved. But what if there are more than 2 values involved? For example, if I call StackPush(1); QueuePush(2); QueuePush(4); StackPop(); StackPush(5); QueuePop(); what values will be returned in the order of bottom(front) from the final array? I know that if I code a program, I would receive a quick answer. But the reason I'm asking this is because I want to hear a logical explanations from a human being, not a computer.

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• How are integers converted to strings under the hood?

  - by CrazyJugglerDrummer

  I suppose the real question is how to convert base2/binary to base10. The most common application of this would probably be in creating strings for output: turning a chunk of binary numerical data into an array of characters. How exactly is this done? my guess: Seeing as there probably isn't a string predefined for each numerical value, I'm guessing that the computer goes through each bit of the integer from right to left, each time incrementing the appropriate values in the char array/base10 notation places. If we take the number 160 in binary (10100000), it would know that a 1 in the 8th place means 128, so it places 1 into the third column, 2 in the second, and 8 in the third. The 1 in the 6th column means 32, and it would add those values to the second and first place, carrying over if needed. After this it's an easy conversion to actual char codes.

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• How to walk through two files simultaneously in Perl?

  - by Alex Reynolds

  I have two text files that contain columnar data of the variety position-value. Here is an example of the first file (file A): 100 1 101 1 102 0 103 2 104 1 ... Here is an example of the second file (B): 20 0 21 0 ... 100 2 101 1 192 3 193 1 ... Instead of reading one of the two files into a hash table, which is prohibitive due to memory constraints, what I would like to do is walk through two files simultaneously, in a stepwise fashion. What this means is that I would like to stream through lines of either A or B and compare position values. If the two positions are equal, then I perform a calculation on the values associated with that position. Otherwise, if the positions are not equal, I move through lines of file A or file B until the positions are equal (when I again perform my calculation) or I reach EOF of both files. Is there a way to do this in Perl?

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