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  • The internal implementation of R's dataset

    - by Yin Zhu
    I am trying to build a data processing program. Currently I use a double matrix to represent the data table, each row is an instance, each column represents a feature. I also have an extra vector as the target value for each instance, it is of double type for regression, it is of integer for classification. I want to make it more general. I am wondering how what kind of structure R uses to store a dataset, i.e. the internal implementation in R.

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  • git merge, git rebase none seems to work, should I delete my github fork and refork from the upstream master?

    - by Joan Yin
    I have to confess my github sins. 4 month ago, I forked a upstream repo, without knowing much of git and pull request, i did some work on master branch locally, later on I realized the mistake, created a new branch, and squashed the changes to one and successfully send a PR later from that branch. the PR is accepted, and I moved on. Now I need to submit another PR. But my master branch is so messed up, when I do merge, or rebase, there are so many mistakes. I probably committed a few more sins this morning. I have been battling this for the whole morning now. so it comes to the point that I want a clean start. Can I delete the github fork and refork from the upstream master? What are the correct steps?

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  • How much Java should I have learnt before trying Android programming?

    - by Sidney Yin
    Hi - I have been seeking beginner learning books in Android, and of course found out that I should learn Java first. So I began studying Java and now I am quite comfortable with objects, classes, inheritance, interfaces, and just moved onto Layouts in Swing as well as Swing Features. But I am starting to wonder.... do I know enough about Java now? Can I start programming Android yet? Of course I can keep going in Java, but have been itching to begin programming Android apps. Any definitive answer here about how much Java I need to know before Android? Thanks so much!

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  • Learn Best Practices at Oracle OpenWorld

    - by Oracle OpenWorld Blog Team
    By Joan JenkinsOracle Advanced Customer Support Services Knows BestLearn key best practices to maximize performance and availability from Oracle Advanced Customer Support Services. Plan to attend one or more of our sessions, with topics including Oracle Exadata best practices, Oracle E-Business Suite upgrades, Oracle GoldenGate, and Oracle Platinum Services. Or stop by the Support Stars Bar to ask questions and get more information. Find out more what you can learn from Oracle Advanced Customer Support Services at Oracle OpenWorld.

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  • WrapPanel doesn't wrap in WPF ListView

    - by Joan Venge
    I am using a ListView with an ItemTemplate like this: <Window.Resources> <DataTemplate x:Key="ItemTemplate"> <WrapPanel Orientation="Horizontal"> <Image Width="50" Height="50" Stretch="Fill" Source="{Binding Cover}"/> <Label Content="{Binding Title}" /> </WrapPanel> </DataTemplate> </Window.Resources> But the Covers do not fill the screen like windows explorer windows. How do I do this? They just get stacked vertically in my version.

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  • Binding Dictionary<T> to a WPF ListBox

    - by Joan Venge
    Given a dictionary of <string, Drink>, how would you bind the dictionary.Values to a WPF ListBox, so that the items use the .Name property? struct Drink { public string Name { get; private set; } public int Popularity { get; private set; } public Drink ( string name, int popularity ) : this ( ) { this.Name = name; this.Popularity = popularity; } }

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  • Showing items as images in a WPF ListView

    - by Joan Venge
    So I have binded a List to a ListView where the List has items of type Album, where it has lots of properties including .Cover, which I is an image on disk. Well since I don't know what type of image is needed and how they have to be loaded (I only know using Image types for Winforms), I don't know the type yet. Can someone show or post me a quick sample where it shows this sort of items being shown as images of a certain fixed size using their .Cover property? In essence this would show: What type .Cover should be How to open images from disk for WFP (assuming it's different than Winforms image loading) How to show them on a ListView as images of a certain fixed size, scaling the images if necessary

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  • Having an outline for MouseOver for a WPF ListView

    - by Joan Venge
    I am using Windows 7 and the current item selection (by default) is to paint the background with cornflower blue. Is it possible to get rid of this and replace it with a 1px outline/border over the listview item that the mouse is over? I basically want to draw a 1px outline/border over any listview item with 1 pixel spacing between the listview item and the outline/border. I am using a WrapPanel with an Image in it for each item.

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  • Naming conventions for private members of .NET types

    - by Joan Venge
    Normally when I have a private field inside a class or a struct, I use camelCasing, so it would be obvious that it's indeed private when you see the name of it, but in some of my colleagues' C# code, I see that they use m_ mostly or sometimes _, like there is some sort of convention. Aren't .NET naming conventions prevent you from using underscores for member names? And when you mention the MS naming conventions or what not, they tell you it's the best way, but don't explain the reasoning behind it.

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  • Why Windows 7 isn't written in C#?

    - by Joan Venge
    I saw a similar question about the reason Google Chrome wasn't written in C#. But with the upcoming version of Windows and Microsoft's flagship language, I am having a hard time understanding why Microsoft isn't pushing C# to its fullest potential to give it more exposure via their market share? In addition can be interpreted as "Is C# and the .Net framework suitable to run a modern OS like Windows 7" Btw this is not a flaming question, but curiosity. I use C# daily and really love it.

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  • Simple regex question?

    - by Joan Venge
    In the streams I am parsing I need to parse something in this pattern: <b>PaintTitle</b></td><td class=detail valign="top" align=left><div align=left><font size=small><b>The new great album by Pet Shop Boys</b> How would I get the string "The new great album by Pet Shop Boys" where <b>PaintTitle</b> is guaranteed to be once per album?

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  • Installing Mapnik 2.2.0 in windows 7 with Python 2.7

    - by Joan Natalie
    I've been trying to install mapnik on my computer for hours but what i always get when I import mapnik is ImportError: DLL load failed: The specified procedure could not be found. I'm using Windows 7. The currently installed software is Geoserver from Opengeo suite. Here is my path %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files\WIDCOMM\Bluetooth Software\;C:\Program Files\Java\jre7\bin;C:\Program Files\Java\jdk1.7.0_45\bin;C:\Python27;C:\mapnik-v2.2.0\lib My python path: C:\Python27;C:\Python27\Lib;C:\Python27\DLLs;C:\Python27\Lib\lib-tk;C:\Program Files\ArcGIS\bin;C:\\mapnik-v2.2.0\python\2.7\site-packages\;C:\mapnik-v2.2.0\bin\;

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  • Converting from a string to boolean in Python?

    - by Joan Venge
    Does anyone know how to do convert from a string to a boolean in Python? I found this link. But it doesn't look like a proper way to do it. I.e. using a built in functionality, etc. EDIT: The reason I asked this is because I learned int("string"), from here. I tried bool ("string") but always got True.

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  • How to have ListView items with Label show up at the bottom of the item not to the right in WPF?

    - by Joan Venge
    I am using a WrapPanel with an Image and Label, but the Label shows up to the right of the item. How can I make it show up at the bottom of the Image/Item? <Window.Resources> <DataTemplate x:Key="ItemTemplate"> <WrapPanel Orientation="Horizontal"> <Image Width="50" Height="50" Stretch="Fill" Source="{Binding Cover}"/> <Label Content="{Binding Title}" /> </WrapPanel> </DataTemplate> </Window.Resources>

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  • Why is Microsoft not developing a Halo-like next gen title using C#? [closed]

    - by Joan Venge
    The question might look subjective but considering Microsoft: Owns the Xbox 360 platform Owns the Windows platform Have their own game studio (MGS) Own other 3rd party developers Is a major publisher makes me wonder why Microsoft doesn't push their flagship language to prove that not only you can cut down significant development time, and therefore money, but also show that you can release a next gen title where the real time interactivity doesn't suffer. If Microsoft were to do this once, I am sure many AAA developers would jump on that wagon too.

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  • How to get checked items in a WPF ListBox?

    - by Joan Venge
    I have a WPF ListBox where I have checkboxes, but what's the way to get the list of items that are checked? The ListBox is data binded to a Dictionary<T>. Here is the XAML: <Window x:Class="WpfApplication.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Grid Margin="10"> <ListBox ItemsSource="{DynamicResource Nodes}" Grid.IsSharedSizeScope="True" x:Name="MyList"> <ListBox.ItemTemplate> <DataTemplate> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition SharedSizeGroup="Key" /> <ColumnDefinition SharedSizeGroup="Name" /> <ColumnDefinition SharedSizeGroup="Id" /> </Grid.ColumnDefinitions> <CheckBox Name="NodeItem" Click="OnItemChecked"> <StackPanel Orientation="Horizontal"> <TextBlock Margin="2" Text="{Binding Value.Name}" Grid.Column="1"/> <TextBlock Margin="2" Text="-" Grid.Column="2"/> <TextBlock Margin="2" Text="{Binding Value.Id}" Grid.Column="3"/> </StackPanel> </CheckBox> </Grid> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </Grid> </Window>

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  • Immutability of structs

    - by Joan Venge
    I read it in lots of places including here that it's better to make structs as immutable. What's the reason behind this? I see lots of Microsoft-created structs that are mutable, like the ones in xna. Probably there are many more in the BCL. What are the pros and cons of not following this guideline?

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  • Best disassembler tool for the .NET reflector?

    - by Joan Venge
    What's the best disassembler tool for the .NET reflector? By best I mean, saving a .NET assembly in a disassembled state in most readable, most likely to compile with fewer changes. The current one I use doesn't show simplified enumeration but shows the full IEnumerable implementations with MoveNext, etc with member names like: this.<4_state CS$<9_CachedAnonymousMethodDelegate3 Btw I am not trying to steal code, just trying out certain things on an already existing assembly instead of writing a similar thing from scratch. In the end, it's what I will learn from this that will stay, not the modified assembly.

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  • How to have a transparent number on top of a winform?

    - by Joan Venge
    So I have a winform that has some winforms controls on it. But in the center of it, I want to show a transparent number on top of everything. Say 60 pixels size. I tried a label and even tried to create a custom control but the transparency didn't work. Any ideas how to do this? This number will change programmatically at runtime several times.

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  • How to bind a List to a WPF treeview using Xaml?

    - by Joan Venge
    I don't know how to bind a List of Drink to a WPF TreeView. struct Drink { public string Name { get; private set; } public int Popularity { get; private set; } public Drink ( string name, int popularity ) : this ( ) { this.Name = name; this.Popularity = popularity; } } List<Drink> coldDrinks = new List<Drink> ( ){ new Drink ( "Water", 1 ), new Drink ( "Fanta", 2 ), new Drink ( "Sprite", 3 ), new Drink ( "Coke", 4 ), new Drink ( "Milk", 5 ) }; } } I have searched the web, for instance saw here. But what's this even mean: ItemsSource="{x:Static local:TreeTest.BoatList}" x:? static? local? How do you specify a collection in your code in the xaml?

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