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• openmp vs opencl for computer vision

  - by user1235711

  I am creating a computer vision application that detect objects via a web camera. I am currently focusing on the performance of the application My problem is in a part of the application that generates the XML cascade file using Haartraining file. This is very slow and takes about 6days . To get around this problem I decided to use multiprocessing, to minimize the total time to generate Haartraining XML file. I found two solutions: opencl and (openMp and openMPI ) . Now I'm confused about which one to use. I read that opencl is to use multiple cpu and GPU but on the same machine. Is that so? On the other hand OpenMP is for multi-processing and using openmpi we can use multiple CPUs over the network. But OpenMP has no GPU support. Can you please suggest the pros and cons of using either of the libraries.

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• Static member object of a class in the same class

  - by Luv

  Suppose we have a class as class Egg { static Egg e; int i; Egg(int ii):i(ii) {} Egg(const Egg &); //Prevents copy-constructor to be called public: static Egg* instance() {return &e} }; Egg Egg::e(47); This code guarantees that we cannot create any object, but could use only the static object. But how could we declare static object of the same class in the class. And also one thing more since e is a static object, and static objects can call only static member functions, so how could the constructor been called here for static object e, also its constructors are private.

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• question about working with System.Drawing.Graphics

  - by backdoor

  hi all. i have a System.Drawing.Point[] filled with some System.Drawing.Point's. so when i want to draw this points as a polygon in a System.Windows.Form instance , the final drawn polygon is not all in the screen or sometimes is very small (in screen shown as 2-3 pixel). i wonder if there is some Library that using that i can just send Point[] to that and thatself scales and ... points and draws polygon manner that all points shown in screen and they are scaled to fit the screen (i mean small objects that shown as 2-3 pixel scale up to fit entire screen); thaks all and sorry for my bad english...

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• problem while switching between Portrait and landscape in android views

  - by vnshetty

  In my application im going to display a web page in web view , it works fine but if i flip between landscape to portrait or vice versa, then it exits and comes to main page. wht is the prblm? logcat: 03-10 13:35:47.123: INFO/WindowManager(69): Setting rotation to 1, animFlags=1 03-10 13:35:47.242: INFO/ActivityManager(69): Config changed: { scale=1.0 imsi=310/260 loc=en_US touch=3 keys=2/1/1 nav=3/1 orien=2 layout=17 uiMode=17 seq=70} 03-10 13:35:47.363: INFO/UsageStats(69): Unexpected resume of com.mireader while already resumed in com.mireader 03-10 13:35:50.413: DEBUG/dalvikvm(69): GC_EXPLICIT freed 395 objects / 20424 bytes in 195ms

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• ChoiceFormat.setChoices confusion about format parameter type and documentation

  - by polygenelubricants

  From the java.text.ChoiceFormat API: setChoices(double[] limits, String[] formats): Set the choices to be used in formatting. Parameters: limits - contains [...] formats - are the formats you want to use for each limit. They can be either Format objects or Strings. When formatting with object Y, if the object is a NumberFormat, then ((NumberFormat) Y).format(X) is called. Otherwise Y.toString() is called. I'm having difficulties understanding the documentation for the formats parameter: how can you possibly pass a Format/NumberFormat object to setChoices if it's declared String[] formats? Note that interestingly, the getters counterpart of setChoices are declared as follows: double[] getLimits() Object[] getFormats() -- not String[]!!! Is this a bug in the API? Should the setter have been declared setChoices(double[], Object[]) instead, or am I not understanding how to use setChoices correctly?

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• How do I extend a WPF application using an addin-like architeture?

  - by Thiado de Arruda

  Lets say I have a WPF application that shows a ListBox with an ArrayList -populated with objects of arbitrary types- as a source, and this application is hosted in an assembly 'A'. By default the ListBox will display the custom object 'ToString' method return value. If a data template for that object type is found, the ListBox will use it for rendering. Imagine that theres another assembly 'B' that references of 'A' and seeks to extend it by providing custom data templates for certain types, to be used in that ListBox. Is there some way to do that without 'A'being aware of B?

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• WPF - How do I style a row based on a binding property value?

  - by Nick

  Hey! So I am trying to bind a collection of objects (IList<) to a WPF datagrid. I would like to make the row background a different color if the 'artist' property is null or empty. I am checking the value stored at the property on the LoadingRow datagrid event. Currently my implementation seems to style all of the rows with an empty or null 'artist' property correctly. The problem is that is also styles the rows where the property is not null or empty in some cases. So some rows are given the red background even though the rows 'artist' property is not null. Can anyone tell me why this could be?? Here is the LoadingRow event: private void trackGrid_LoadingRow(object sender, DataGridRowEventArgs e) { Track t = e.Row.DataContext as Track; if (String.IsNullOrEmpty(t.Artist)) { e.Row.Background = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Color.FromArgb(255, 255, 125, 125)); } }

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• How to quickly save more than a thousand entries in the database in NHibernate?

  - by Anry

  I create and retain objects of business class in the loop for (int i = num.StartNumber; i <= num.EndNumber; i++) { var voucher = new Domain.GiftVouchers { UniqueNumber = i.ToString(), Denomination = num.Denomination, ExpiryDateTime = DateTime.Now }; voucher.Save(); } The method of preservation NHibernate using (ISession session = NHibernateHelper.OpenSession()) using (ITransaction transaction = session.BeginTransaction()) { session.SaveOrUpdate(giftVouchers); transaction.Commit(); } If you generate 1000 + entries, we have to wait long. How can I increase the speed of this operation?

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• how do I find the number of xml children in AS3

  - by vasion

  so live docs says this for calling .lenght() on an XML object For XML objects, this method always returns the integer 1. The length() method of the XMLList class returns a value of 1 for an XMLList object that contains only one value. i called it on an xml that looked like this: <xml> <picture>1</picture> <picture>2</picture> </xml> and it reallt returned 1. how do i get the number of children in my xml?

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• Using a backwards relation (i.e FOO_set) for ModelChoiceField in Django

  - by Bwmat

  I have a model called Movie, which has a ManyToManyField called director to a model called Person, and I'm trying to create a form with ModelChoiceField like so: class MovieSearchForm(forms.Form): producer = forms.ModelChoiceField(label='Produced by', queryset=movies.models.Person.producer_set, required=False) but this seems to be failing to compile (I'm getting a ViewDoesNotExist exception for the view that uses the form, but it goes away if I just replace the queryset with all the person objects), I'm guessing because '.producer_set' is being evaluated too 'early'. How can I get this work? here are the relevant parts of the movie/person classes: class Person(models.Model): name = models.CharField(max_length=100) class Movie(models.Model): ... producer = models.ForeignKey(Person, related_name="producers") director = models.ForeignKey(Person, related_name="directors") What I'm trying to do is get ever Person who is used in the producer field of some Movie.

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• C# Type Conversion

  - by PSU_Kardi

  Hi guys, I have two objects. Object A and Object B. Object A is an instance of a class that was generated from several XSD files. Used xsd.exe /c and compiled them. Now I have my new object. I also have a web service, returning something very similar to object A. So right now I have something along the lines of this: WebService.foo myResponseObj = MyService.GetObject(inData); MyFramework.foo myClientObj = new MyFramework.foo(); What I want to do is this myClientObj = (MyFramework.foo)myResponseObj However, it's not really liking this. Says "Cannot implicitly convert MyFramework.foo[] to WebService.foo[] Any ideas on how to resolve this? The object is quite large and they are basically identical.

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• Best way to bind node collection to itemscontrol in Silverilght

  - by mrtrombone

  I have a Silverlight project where the main objects are just a bunch of nodes that are joined to each other. A parent node can have many children. I want to be able to bind the nodes to an itemscontrol or similar and so was wondering how to best structure the parent child relationship. Is it OK to create a flat top level list of all nodes (List allNodes) and add each node to that, binding the list to the itemscontrol, then on top of that add each node to it's parent's 'childnodes' list to establish the structure - or am I doing some kind of ugly doubling up? Just hoping there is some kind of best practice or pattern I can latch on to Thanks

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• Retrieving data from database. Retrieve only when needed or get everything?

  - by RHaguiuda

  I have a simple application to store Contacts. This application uses a simple relational database to store Contact information, like Name, Address and other data fields. While designing it, I question came to my mind: When designing programs that uses databases, should I retrieve all database records and store them in objects in my program, so I have a very fast performance or I should always gather data only when required? Of course, retrieving all data can only be done if it`s not too many, but do you use this approach when you make sure that the database will be small (< 300 records for example)? I have designed once a similar application that fetches data only when needed, but that was slow (using a Access database). Thanks for all help.

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• Enable export to XML via HTTP on a large number of models with child relations

  - by Vasil

  I've a large number of models (120+) and I would like to let users of my application export all of the data from them in XML format. I looked at django-piston, but I would like to do this with minimum code. Basically I'd like to have something like this: GET /export/applabel/ModelName/ Would stream all instances of ModelName in applabel together with it's tree of related objects . I'd like to do this without writing code for each model. What would be the best way to do this?

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• Map browser DOM using Javascript

  - by EddyR

  I'm trying to map a browsers DOM using javascript. It should list all the functions and attributes associated with it and it should also recurse through any object attributes. Now as I understand it 'window' is the most top-level node (although I've see a reference to 'top' as well in Chrome.) then 'document', etc. However I've never seen 'Node' under 'window' and yet I can call it. So where is 'Node' located? Is there a level above 'window' or is it a separate object (W3C says it's supposed to be inherited by 'document' only.)? I've been playing with a function to do this but I keep getting weird results so I'm not post it here. Alternatively - is it possible to get the properties from the object types instead of the object reference itself? for example 'DOMWindow' instead of 'window'. I think this would stop duplicating data from inherited objects.

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• Crystal Reports, alignment when printing

  - by andySF

  Hello, i have a report with 2 objects. a text object from left to right and a database field on top of this object. When I load the report in viewer(or print from viewer) it looks OK but when I print the report programmatically with ReportDocument.PrintToPrinter() the database field moves to to the left and as a result it print on the text object. Concatenate the text and database field is not an option. The margins are the same in viewer and before to print programmatically. in viewer: http://promagic.hopto.org/screens/screen_2010-5-13_10_24_7-531.png programmatically: http://promagic.hopto.org/screens/screen_2010-5-13_10_25_55-187.png (the bold text is from db) Can anyone help me? Thanks!

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• Resizing an image with alpha channel

  - by Hafthor

  I am writing some code to generate images - essentially I have a source image that is large and includes transparent regions. I use GDI+ to open that image and add additional objects. What I want to do next is to save this new image much smaller, so I used the Bitmap constructor that takes a source Image object and a height and width, then saved that. I was expecting the alpha channel to be smoothed like the color channels, but this did not happen -- it did result in a couple of semitransparent pixels, but overall it is very blocky. What gives? Using img As New Bitmap("source100x100.png") ''// Drawing stuff Using simg As New Bitmap(img, 20, 20) simg.Save("target20x20.png") End Using End Using Edit: I think what I want is SuperSampling, like what Paint.NET does when set to "Best Quality"

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• generate Grid from template

  - by theXs

  Howdy, I've got another question regarding phone 7... I want to generate a couple of Grids in a stackpanel - since they all have the same layout I thought it would be a great idea to use DataTemplates ... But then I found that the GRID Object has no "DataTemplate" Property and now I'm kinda stuck ... the template which I use is the following: <DataTemplate x:Key="Speise"> <Grid> <TextBlock Height="36" Margin="8,43,104,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top"/> <TextBlock HorizontalAlignment="Right" Height="36" Margin="0,44,8,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top" Width="92"/> </Grid> </DataTemplate> The way I now thought of creating my objects is: Grid blubber = (Grid)this.Resources["Speise"]; But that is not working ... I think it's again a really short thing, but I have no clue of how to google for it :(

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• Java and Different Types of Stacks

  - by Rarge

  Currently the only stack I know anything about is Vector, I normally use this in place of an array but I understand that there is other types of stacks and they all suit different jobs. The project I am currently working on requires me to be inserting objects in a certain position inside a stack, not always the front of the stack and I am under the impression that a Vector may not be the best class for this job. Could somebody please give me a brief description of the other types of stacks available to me with the Java language and their advantages and disadvantages? Are these names homogeneous? E.g. Are they only used in the Java language or are they used as general terms in Computer Science? Thank you

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• Django design question: extending User to make users that can't log in

  - by jobrahms

  The site I'm working on involves teachers creating student objects. The teacher can choose to make it possible for a student to log into the site (to check calendars, etc) OR the teacher can choose to use the student object only for record keeping and not allow the student to log in. In the student creation form, if the teacher supplies a username and a password, it should create an object of the first kind - one that can log in, i.e. a regular User object. If the teacher does not supply a username/password, it should create the second type. The other requirement is that the teacher should be able to go in later and change a non-logging-in student to the other kind. What's the best way to design for this scenario? Subclass User and make username and password not required? What else would this affect?

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• using KVO to update an NSTableView filtered by an NSPredicate

  - by KingRufus

  My UI is not updating when I expect it to. The application displays "projects" using a view similar to iTunes -- a source list on the left lets you filter a list (NSTableView) on the right. My filters update properly when they are examining any simple field (like name, a string), but not for arrays (like tags). I'm removing a tag from one of my objects (from an NSMutableArray field called "tags") and I expect it to disappear from the list because it no longer matches the predicate that is bound to my table's NSArrayController. ProjectBrowser.mm: self.filter = NSPredicate* srcPredicate = [NSPredicate predicateWithFormat:@"%@ IN %K", selectedTag, @"tags"]; Project.mm: [self willChangeValueForKey:@"tags"]; [tags removeAllObjects]; [self didChangeValueForKey:@"tags"]; I've also tried this, but the result is the same: [[self mutableArrayValueForKey:@"tags"] removeAllObjects]; Interface Builder setup: a ProjectBrowser object is the XIB's File Owner an NSArrayController (Project Controller) has its Content Array bound to "File's Owner".projects Project Controller's filter predicate is bound to "File's Owner".filter NSTableView's column is bound to "Project Controller".name

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• Maximum executable size on the iPhone?

  - by Sirp

  Is there a maximum size of executables or executables + shared objects on the iPhone? I've been developing an app that has been crashing on startup or early in execution with SIGSYS. Removing code from the program has helped, though structuring data so the code is simply not executed does not. This could be memory corruption, of some kind, however when I compiled with -Os rather than -O2 or -O3 the size of my executable goes down from 5.15MB to 3.60MB and the application runs perfectly. I also have a bunch of libraries I use, of course. I'm wondering, is there a limit on the size of executable code on the iPhone? Or am I just 'getting lucky' and masking memory corruption when I use -Os?

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• how much time it will take to learn action script 3 in flash

  - by Mirage

  I know php mysql , javascript , jquery very well. I have never touced flash. Now have to do website in complete flash with action scripting. Keeping flash animation and scripting separate. How much time it will take for me to build e,g 1)Simple page with 1 column layout like , header , navigation bar , content. 2)The navigation items will be loaded from database using xml and flash 3)The content will also load from database depending upon navigation item clicked HOw much time forinserting flash objects and how much time for scripting. Thanks

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• How to remove a single event in a recuring event

  - by albertos

  hi all. I' m having an issue with fullCalendar. I created a script that, adds an event to fullCalendar, along a day range, and set a unique id in order to have this event recur. let say for example that i have a recuring event from 1/1/10 till 10/1/10. i create 10 single event Objects with the same id, and place then on fullCalendar. my question is, that i want to exclude a single day over this recuring event. (for example 3/1/10). i found out, that if i remove that particural event from the sources table and then update the event its fine. but how can i get on runtime the actucal index of this eventObj on sources table? Note that, i add the events on the fullCalendar using the .fullCalendar("renderEvent") method. Thanks.

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• One big call vs. multiple smaller TSQL calls

  - by BrokeMyLegBiking

  I have a ADO.NET/TSQL performance question. We have two options in our application: 1) One big database call with multiple result sets, then in code step through each result set and populate my objects. This results in one round trip to the database. 2) Multiple small database calls. There is much more code reuse with Option 2 which is an advantage of that option. But I would like to get some input on what the performance cost is. Are two small round trips twice as slow as one big round trip to the database, or is it just a small, say 10% performance loss? We are using C# 3.5 and Sql Server 2008 with stored procedures and ADO.NET.

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