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• How can I find any control in the ItemTemplate of a TabControl?

  - by mrok

  Hi, I have a TabControl <TabControl Name="myTabControl" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" Margin="4"> <TabControl.ItemTemplate> <DataTemplate> <DockPanel Width="120"> <Button Name="CloseScreen"/> <ContentPresenter Content="{Binding Path=DisplayName}" VerticalAlignment="Center" /> </DockPanel> </DataTemplate> </TabControl.ItemTemplate> </TabControl> I want to find the button which is located in the ItemTemplate from code. Thank you.

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• Creating a smart text generator

  - by royrules22

  I'm doing this for fun (or as 4chan says "for teh lolz") and if I learn something on the way all the better. I took an AI course almost 2 years ago now and I really enjoyed it but I managed to forget everything so this is a way to refresh that. Anyway I want to be able to generate text given a set of inputs. Basically this will read forum inputs (or maybe Twitter tweets) and then generate a comment based on the learning. Now the simplest way would be to use a Markov Chain Text Generator but I want something a little bit more complex than that as the MKC basically only learns by word order (which word is more likely to appear after word x given the input text). I'm trying to see if there's something I can do to make it a little bit more smarter. For example I want it to do something like this: Learn from a large selection of posts in a message board but don't weight it too much For each post: Learn from the other comments in that post and weigh these inputs higher Generate comment and post See what other users' reaction to your post was. If good weigh it positively so you make more posts that are similar to the one made, and vice versa if negative. It's the weighing and learning from mistakes part that I'm not sure how to implement. I thought about Artificial Neural Networks (mainly because I remember enjoying that chapter) but as far as I can tell that's mainly used to classify things (i.e. given a finite set of choices [x1...xn] which x is this given input) not really generate anything. I'm not even sure if this is possible or if it is what should I go about learning/figuring out. What algorithm is best suited for this? To those worried that I will use this as a bot to spam or provide bad answers to SO, I promise that I will not use this to provide (bad) advice or to spam for profit. I definitely will not post it's nonsensical thoughts on SO. I plan to use it for my own amusement. Thanks!

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• Adding a selection box into an ItemsControl?

  - by Jens

  I have a WPF ItemsControl with a Canvas ItemPanel. Drawing from an internal source, it displays lots of automatically generated Rectangles. As of now, it looks like this: <Window // .. NameSpaces > <Window.Resources> <DataTemplate x:Key="binTemplate"> <Rectangle x:Name="Rect" VerticalAlignment="Bottom" Canvas.Left="10" StrokeThickness="0"> // .. Databinding Height, Width, etc </Rectangle> </DataTemplate> </Window.Resources> <DockPanel x:Name="LayoutRoot" LastChildFill="True"> <ItemsControl ItemsSource="{Binding Bins}" ItemTemplate="{StaticResource binTemplate}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <Canvas MouseDown="Canvas_MouseDown" MouseMove="Canvas_MouseMove" MouseUp="Canvas_MouseUp"> <Rectangle x:Name="Selection" Canvas.Left="0" Canvas.Top="0" Visibility="Hidden" /> </Canvas> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> </ItemsControl> </DockPanel> </Window> I now try to implement a selection box, too.. well.. select my Rectangles. =) I tried just adding the box into the ItemsControl PanelTemplate, and controlling it with the Canvas mouse events, but it appears I am not allowed to do so. The error message is "Cannot explicitly modify Children collection of Panel used as ItemsPanel for ItemsControl. ItemsControl generates child elements for Panel." What is the preferred way to implement such behavior? I thought about overlaying another canvas (using negative Margin) and drawing the selection box in there, but that seems like a bad hack. Thanks in advance!

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• design time usercontrols - I can't see anything!

  - by taglius

  newbie question, please forgive... I'm developing a Wpf UserControl that will eventually be bound to a business object. The usercontrol is little more than a series of laid out TextBlocks, and perhaps (later) an image or two. As I'm laying out the usercontrol, I can put dummy text into all the TextBlocks so I can see what the usercontrol will look like, but as soon as I change the text property to contain the Binding information: <TextBlock Margin="0,12.8,42,0" Name="lblLastName" FontSize="8" Height="19" VerticalAlignment="Top" Text="{Binding Mode=OneWay, Path=LastName}"/> Then I can no longer see the textbox, or any "placeholder" text. This makes it very difficult to adjust the location and sizes of all the controls on the UserControl. In WinFormas programming, you could set binding information independently of the Text property, so you could at least see the Placeholder text during design time development. It's going to be pretty hard to visually arrange a bunch of invisible TextBlocks! What's the standard solution for this?

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• strange problem with WriteBeginTag

  - by user276640

  i use such code, but it renders with error <li class="dd0"><div id="dt1"<a href="http://localhost:1675/Category/29-books.aspx">Books</a></div></li> there is no > in opening tag div. what the problem? writer.WriteBeginTag("li"); //writer.WriteAttribute("class", this.CssClass); writer.WriteAttribute("class", "dd0"); if (!String.IsNullOrEmpty(this.LiLeftMargin)) { writer.WriteAttribute("style", string.Format("margin-left: {0}px", this.LiLeftMargin)); } writer.Write(HtmlTextWriter.TagRightChar); writer.WriteBeginTag("div"); writer.WriteAttribute("id", "dt1"); this.HyperLink.RenderControl(writer); writer.WriteEndTag("div"); writer.WriteEndTag("li");

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• strange chi-square result using scikit_learn with feature matrix

  - by user963386

  I am using scikit learn to calculate the basic chi-square statistics(sklearn.feature_selection.chi2(X, y)): def chi_square(feat,target): """ """ from sklearn.feature_selection import chi2 ch,pval = chi2(feat,target) return ch,pval chisq,p = chi_square(feat_mat,target_sc) print(chisq) print("**********************") print(p) I have 1500 samples,45 features,4 classes. The input is a feature matrix with 1500x45 and a target array with 1500 components. The feature matrix is not sparse. When I run the program and I print the arrray "chisq" with 45 components, I can see that the component 13 has a negative value and p = 1. How is it possible? Or what does it mean or what is the big mistake that I am doing? I am attaching the printouts of chisq and p: [ 9.17099260e-01 3.77439701e+00 5.35004211e+01 2.17843312e+03 4.27047184e+04 2.23204883e+01 6.49985540e-01 2.02132664e-01 1.57324454e-03 2.16322638e-01 1.85592258e+00 5.70455805e+00 1.34911126e-02 -1.71834753e+01 1.05112366e+00 3.07383691e-01 5.55694752e-02 7.52801686e-01 9.74807972e-01 9.30619466e-02 4.52669897e-02 1.08348058e-01 9.88146259e-03 2.26292358e-01 5.08579194e-02 4.46232554e-02 1.22740419e-02 6.84545170e-02 6.71339545e-03 1.33252061e-02 1.69296016e-02 3.81318236e-02 4.74945604e-02 1.59313146e-01 9.73037448e-03 9.95771327e-03 6.93777954e-02 3.87738690e-02 1.53693158e-01 9.24603716e-04 1.22473138e-01 2.73347277e-01 1.69060817e-02 1.10868365e-02 8.62029628e+00] ********************** [ 8.21299526e-01 2.86878266e-01 1.43400668e-11 0.00000000e+00 0.00000000e+00 5.59436980e-05 8.84899894e-01 9.77244281e-01 9.99983411e-01 9.74912223e-01 6.02841813e-01 1.26903019e-01 9.99584918e-01 1.00000000e+00 7.88884155e-01 9.58633878e-01 9.96573548e-01 8.60719653e-01 8.07347364e-01 9.92656816e-01 9.97473024e-01 9.90817144e-01 9.99739526e-01 9.73237195e-01 9.96995722e-01 9.97526259e-01 9.99639669e-01 9.95333185e-01 9.99853998e-01 9.99592531e-01 9.99417113e-01 9.98042114e-01 9.97286030e-01 9.83873717e-01 9.99745466e-01 9.99736512e-01 9.95239765e-01 9.97992843e-01 9.84693908e-01 9.99992525e-01 9.89010468e-01 9.64960636e-01 9.99418323e-01 9.99690553e-01 3.47893682e-02]

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• multithreading issue

  - by vbNewbie

  I have written a multithreaded crawler and the process is simply creating threads and having them access a list of urls to crawl. They then access the urls and parse the html content. All this seems to work fine. Now when I need to write to tables in a database is when I experience issues. I have 2 declared arraylists that will contain the content each thread parse. The first arraylist is simply the rss feed links and the other arraylist contains the different posts. I then use a for each loop to iterate one while sequentially incrementing the other and writing to the database. My problem is that each time a new thread accesses one of the lists the content is changed and this affects the iteration. I tried using nested loops but it did not work before and this works fine using a single thread.I hope this makes sense. Here is my code: SyncLock dlock For Each l As String In links finallinks.Add(l) Next End SyncLock SyncLock dlock For Each p As String In posts finalposts.Add(p) Next End SyncLock ... Dim i As Integer = 0 SyncLock dlock For Each rsslink As String In finallinks postlink = finalposts.Item(i) i = i + 1 finallinks and finalposts are the two arraylists. I did not include the rest of the code which shows the threads working but this is the essential part where my error occurs which is basically here postlink = finalposts.Item(i) i = i + 1 ERROR: index was out of range. Must be non-negative and less than the size of the collection Is there an alternative?

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• My 3D object (opengl es) is disappearing behind the iPhone camera view

  - by KLC

  I have an augmented reality iPhone app that I am converting from Core Animation to OpenGL ES 1.1. I have added code that has been modified from the Apple OpenGL template. My problem is that my 3D object , when translating along the negative Z-axis (away from the user), appears to disappear into the camera view, until its completely gone. I have experimented with several solutions, but to no avail. What I have determined: Using the 3D icosahedron from Jeff Lamarche's blog here, the object starts it at 0,0,0 and then translates with decreasing z coordinates. By the time the z value reaches -2.0f, the object is gone. It appears as if it is disappearing behind the camera view. This is how I set my frustrum & viewport (unchanged from Apple's code) glMatrixMode(GL_PROJECTION); size = zNear * tanf(DEGREES_TO_RADIANS(fieldOfView) / 2.0); //Grab the size of the screen CGRect rect = self.bounds; glFrustumf(-size, size, -size / (rect.size.width / rect.size.height), size / (rect.size.width / rect.size.height), zNear, zFar); glViewport(0, 0, rect.size.width, rect.size.height); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); What I have tried: The camera view is the main view and several other views are added to it as subviews, including the openGLView. I have commented those views out for test purposes. I have applied CATransforms to move the openGLView in the z direction -500 and +500, and done the same to the camera view. I have also changed the zFar in the above code to 1.0f, and it still disappears at z position of -2.0, which doesn't make sense (shouldn't it disappear at z=1.0?) My experimentation has got me more confused than when I started ( which usually means I am missing a key piece, but I can't figure out what). Thanks for your help.

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• How to access a control placed inside data template of listbox?

  - by Subhen

  Hi I have the following code: <ListBox x:Name="foldersListBox" Grid.Column="0" MouseLeftButtonUp="foldersListBox_MouseLeftButtonUp" BorderThickness="0" Height="AUTO" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Disabled"> <DataTemplate> <Border BorderBrush="LightGray" BorderThickness="2" CornerRadius="4"> <Image x:Name="folderImage" Width="70" Height="70" Margin="3" /> </Border> </DataTemplate> </ListBox> Now when I am trying to access folderImage from code behind. I can use the loaded event and typecast the sender as Image type , but I dont want that way. Help plz. Thanks, Subhen

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• How can I select this element?

  - by Kyle Sevenoaks

  Hi, I have code blindness, it's like snowblindness, just wth far too much code. I have a div class dynamically generated, <div class="even last"> How can I select that with CSS? div.even last { background-color:#ffffff; height:100%; border-top:1px solid #F5F5F5; padding:2px; margin-top:35px; } Doesn't seem to work, and I just can't think more.. Thanks :)

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• Naive Bayes matlab, row classification

  - by Jungle Boogie

  How do you classify a row of seperate cells in matlab? Atm I can classify single coloums like so: training = [1;0;-1;-2;4;0;1]; % this is the sample data. target_class = ['posi';'zero';'negi';'negi';'posi';'zero';'posi']; % target_class are the different target classes for the training data; here 'positive' and 'negetive' are the two classes for the given training data % Training and Testing the classifier (between positive and negative) test = 10*randn(25, 1); % this is for testing. I am generating random numbers. class = classify(test,training, target_class, 'diaglinear') % This command classifies the test data depening on the given training data using a Naive Bayes classifier Unlike the above im looking at wanting to classify: A B C Row A | 1 | 1 | 1 = a house Row B | 1 | 2 | 1 = a garden Can anyone help? Here is a code example from matlabs site: nb = NaiveBayes.fit(training, class) nb = NaiveBayes.fit(..., 'param1',val1, 'param2',val2, ...) I dont understand what param1 is or what val1 etc should be?

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• WPF trigger when data is changing

  - by 0xDEAD BEEF

  How do i create trigger, which fires, when binding changes value? <ContentControl Content="{Binding Path=ActiveView}" Margin="0,95,0,0"> <ContentControl.Triggers> <--some triger to fire, when ActiveView is changing or has changed ?!?!? --> </ContentControl.Triggers> public Object ActiveView { get { return m_ActiveView; } set { if (PropertyChanging != null) PropertyChanging(this, new PropertyChangingEventArgs("ActiveView")); m_ActiveView = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("ActiveView")); } }

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• Regular expressions - finding and comparing the first instance of a word

  - by Dan

  Hi there, I am currently trying to write a regular expression to pull links out of a page I have. The problem is the links need to be pulled out only if the links have 'stock' for example. This is an outline of what I have code wise: <td class="prd-details"> <a href="somepage"> ... <span class="collect unavailable"> </td> <td class="prd-details"> <a href="somepage"> ... <span class="collect available"> </td> What I would like to do is pull out the links only if 'collect available' is in the tag. I have tried to do this with the regular expression: (?s)prd-details[^=]+="([^"]+)" .+?collect{1}[^\s]+ available However on running it, it will find the first 'prd-details' class and keep going until it finds 'collect available', thereby taking the incorrect results. I thought by specifying the {1} after the word collect it would only use the first instance of the word it finds, but apparently I'm wrong. I've been trying to use different things such as positive and negative lookaheads but I cant seem to get anything to work. Might anyone be able to help me with this issue? Thanks, Dan

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• Youtube video embed in WebView and MoviePlayer control

  - by Tronic

  hi, i embed a youtube video into a webview. the problem is: when i pop the current view (which includes the webview) from navigation controller, the the movie itself stops, but the audio is continues running. when i push the view controller on the navigation controller again, i can play the movie newly, but the old audio is still there. my webview code ids_ = [NSArray arrayWithObjects:@"2b84g38Z_60",@"3URx0tM-rMc",@"HZpi-2HVhq0",@"Hhns0DRPI44",@"hRuoxRQ4Q3k",@"lkMXwNBGRA8",@"tXGc6wWIFJo",@"uzGdEn8aW-Q",@"ZAoEBdt8C5M",@"vn8EJqt2BvQ",@"7Z_qRbjG6Ck",@"JspRcxGUijs"@"lM2lcVOh5YU",@"2b84g38Z_60",nil]; int numIds_ = [ids_ count]; NSLog(@"%d", arc4random()%numIds_); NSString *youTubeVideoHTML = [[NSString alloc] initWithFormat:@"<html><head></head><body style=\"margin:0;background-color:#000;\"><iframe class=\"youtube-player\" type=\"text/html\" width=\"640\" height=\"365\" src=\"http://www.youtube.com/embed/%@\" frameborder=\"0\"></iframe></body></html>", [ids_ objectAtIndex:arc4random()%numIds_]]; NSLog(youTubeVideoHTML); [youtubeView loadHTMLString:youTubeVideoHTML baseURL:nil]; thanks in advance

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• wpf keep base style in custom control

  - by Archana R

  Hello, I have created a custom button as i wanted an image and a text inside it as follows: <Style TargetType="{x:Type Local:ImageButton}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Local:ImageButton}"> <StackPanel Height="Auto" Orientation="Horizontal"> <Image Margin="0,0,3,0" Source="{TemplateBinding ImageSource}"/> <TextBlock Text="{TemplateBinding Content}" /> </StackPanel> </ControlTemplate> </Setter.Value> </Setter> </Style> Here, ImageButton is a class which inherits from Button class and has ImageSource as a dependency property. But i want to keep the look and feel of the original button. How can i do it? Thanks.

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• Adding an ActionScript eventListener that takes the whole sprite

  - by Rudy

  Hello, I have a very simple constructor in ActionScript as the following: public function ButtonTest() { this.addEventListener(MouseEvent.CLICK, browseFiles); } My problem is that when I open the SWF file itself, the window is not full size and the whole area responds to the mouse click. If I expand the window to full size, a margin of like 200 pixels on the left is not clickable. I hope I make some sense. The issue is that I had the .SWF file in a in my HTML code, and when I make it small, it seems that only the center of the SWF file is clickable. I hope someone can please help me. Thank you, Rudy

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• WPF Custom Control with Image problem

  - by user311883

  Hi all, I am quite new to WPF/XAML and I am currently facing a problem. I have a solution with two projects in it, the first project is a Custom Control Library with a custom Window form control inside. The second project is a WPF application using my custom window form. All work fine except for the form Icon. In the WPF application project I set my window icon property to "/ProjectTwoNameSpace;component/Resources/Images/Film.ico", and in the WPF custom control I try to show that image that way : <Image Grid.Column="0" Margin="3" Width="27" Height="27"> <Image.Source> <BitmapImage UriSource="{Binding Path=Icon}" /> </Image.Source> </Image> But it doesn't work, I get a error at runtime saying that the property UriSource or StreamSource must be set for my tag. Anyone can help me ? I think it's jsut a WPF newbie problem ^^

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• Is there a practical alternative to struct inheritance? (C#)

  - by Tim Coulter

  I am writing code that will populate the Margin, Padding and BorderThickness properties of classes in the System.Windows.Documents namespace. Each of these properties accepts a value in the form of a System.Windows.Thickness, which is a struct. However, I wish to associate some additional data with each of these property assignments, which may subsequently be retrieved by my code. If Thickness were a class, I would inherit from it and define properties in the subclass to store my additional data items. But since it is a struct, inheritance is not possible. Is there any practical way to achieve this, while maintaining type-compatibility with the properties I am populating? Thanks for your ideas, Tim

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• Toottip data issue in jquery flot

  - by Muhammad

  I am using Jquery plot.Every thing is working except tooltip data. Total data shown on a line is 190 which is equal to total published PLUS total unpublished.Total Published is 51 which is shown in tooltip.Now the other portion of tooltip shows 190 instead of 190-51 = 139 here is my code var options1 = { series: {stack: stack, lines: { show: lines, fill: false, steps: steps }, bars: { show: bars, barWidth: 0.4 }, points: { show: true} }, grid: { hoverable: true //IMPORTANT! this is needed for tooltip to work }, tooltip: true, tooltipOpts: { content: "%s : %y", shifts: { x: -60, y: 25 } }, legend:{'position':'ne','show':true,'margin':[-3, -20],'backgroundOpacity':0.1, 'noColumns': 4, 'container': null}, xaxis: {ticks: dest4 ,}, }; what i should do with this line to show exact data content: "%s : %y",

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• Spacing from outer space

  - by meo

  I just wonder where is this space between the end of the image and the end of the li's are coming from: http://bluesys.ch/lussy/ its just a simple UL li img code: div#slider { border: 5px solid #fff; } div#slider ul li { border-bottom: 1px solid pink; } div#slider ul li img { border-bottom: 1px solid green; margin: 0; } note that all margins and paddings are set to 0 by my reset.css can someone help me out? I colored the borders that you can see the spacing i speak of. I use firefox.

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• How to create column width in CSS that expands with large images yet stays a default size for normal

  - by ChrisJF

  I am creating an HTML5 web page with a one column layout. Basically, it is a forum thread with individual posts. I have specified in my CSS file the column to be 600px wide and centered it in the window using margin: 0 auto;. However, some images that are in the individual posts are larger than 600px and spill out of the column. I'd like to widen an individual post to fit the larger images. However, I want all the other posts to still be 600px wide. Right now, I'm just using overflow:auto which will create a scroll bar, but this is less than ideal. Is this possible to have the an individual post width grow for larger content yet stay fixed for normal content? Is this possible using just pure CSS? Thanks in advance!

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• implement button click in html

  - by vbNewbie

  I have been trying to execute a button event in html page that displays additional content on the web page. I am getting a null reference error when using the getelementbyid and not sure how to change this. Here is the html reference I need to engage: <div class="button" style="float:none;width:180px;margin:20px auto 30px;"><a href="#" id="more" style="width:178px">Show more ?</a></div> </div> and here is my code: Dim wb As New WebBrowser wb.Navigate(fromUrl) While wb.ReadyState <> WebBrowserReadyState.Complete Application.DoEvents() End While Debug.Write(wb.DocumentText) Dim htmlElements As HtmlElementCollection = wb.Document.GetElementsByTagName("<a") If Not wb.Document Is Nothing Then Try If wb.DocumentText.Contains("more") Then If wb.Document.GetElementById("more").GetAttribute("href") Then wb.Document.GetElementById("more").InvokeMember("#") End If End If Catch ex As Exception MessageBox.Show(ex.Message.ToString) End Try End If I appreciate any ideas.

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• Canvas element covering the entire screen?

  - by Stefan Kendall

  I'm trying to use <canvas> in iPhone Safari, and if I place the element in the body, there are unused pixels to the left and top of the element. I tried specifying margin:0;padding:0 with CSS to no avail. What's going on here? <html> <head> $(document).ready(function() { $('#screen').attr("height", $(window).height() ); $('#screen').attr("width", $(window).width() ); //prevent scrolling $(document).bind('touchstart touchmove', function(e) { e.preventDefault(); }); }); </script> </head> <body> <canvas id = "screen"> </canvas> </body> </html>

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• Firefox Border Radius Not Showing

  - by Harry

  I am using the following css #helper{ position:absolute; bottom:0; width:100%; } #key{ width:950px; margin:0 auto; z-index:2; -moz-border-radius-topleft:8px; -moz-border-radius-topright:8px; } <-- inside body --> <div id="helper"> <div id="key">SHould be rounded top corners?</div> </div> Yet in Firefox it is not showing after refresh. Any ideas where should I be looking first? Thanks

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• Ideas Related to Subset Sum with 2,3 and more integers

  - by rolandbishop

  I've been struggling with this problem just like everyone else and I'm quite sure there has been more than enough posts to explain this problem. However in terms of understanding it fully, I wanted to share my thoughts and get more efficient solutions from all the great people in here related to Subset Sum problem. I've searched it over the Internet and there is actually a lot sources but I'm really willing to re-implement an algorithm or finding my own in order to understand fully. The key thing I'm struggling with is the efficiency considering the set size will be large. (I do not have a limit, just conceptually large). The two phases I'm trying to implement ideas on is finding two numbers that are equal to given integer T, finding three numbers and eventually K numbers. Some ideas I've though; For the two integer part I'm thing basically sorting the array O(nlogn) and for each element in the array searching for its negative value. (i.e if the array element is 3 searching for -3). Maybe a hash table inclusion could be better, providing a O(1) indexing the element? For the three or more integers I've found an amazing blog post;http://www.skorks.com/2011/02/algorithms-a-dropbox-challenge-and-dynamic-programming/. However even the author itself states that it is not applicable for large numbers. So I was for 2 and 3 and more integers what ideas could be applied for the subset problem. I'm struggling with setting up a dynamic programming method that will be efficient for the large inputs as well.

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