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Update R using RStudio
...launch it.
In case you need to do it manually, in RStudio, go to :Tools -> options -> General.
Check @micstr's answer for a more detailed walkthrough.
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App Inventor 2 列表积木完全指南：从入门到精通，一篇搞定数据存储 - App...
...用变量名 item 引用当前元素：
Map: [ item x 2 ] -> [1,2,3] 变为 [2,4,6]复制代码
2. 创建过滤列表（Filter）
根据布尔表达式筛选满足条件的元素：
Filter: [ item > 2 ] -> [1,2,3,4] 变为 [3,4]复制代...
How to set JAVA_HOME environment variable on Mac OS X 10.9?
...ll you have to do is:
echo export "JAVA_HOME=\$(/usr/libexec/java_home)" >> ~/.bash_profile
and restart your shell.
If you have multiple JDK versions installed and you want it to be a specific one, you can use the -v flag to java_home like so:
echo export "JAVA_HOME=\$(/usr/libexec/java_h...
Avoiding “resource is out of sync with the filesystem”
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Window -> Preferences -> General -> Workspace
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Disabling highlighting of current line in the Visual Studio editor
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Is there a simple way to disable this highlighting?
Tools -> Options -> Text Editor, in the Display group, uncheck "Highlight current line"
Which parameter in Fonts and Colors dialog controls the background color of the currently selected line in the editor?
The colors are...
How can I sort generic list DESC and ASC?
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With Linq
var ascendingOrder = li.OrderBy(i => i);
var descendingOrder = li.OrderByDescending(i => i);
Without Linq
li.Sort((a, b) => a.CompareTo(b)); // ascending sort
li.Sort((a, b) => b.CompareTo(a)); // descending sort
Note that without Linq, the lis...
Android adb “Unable to open sync connection!”
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Settings -> Applications -> Development -> USB debugging
– Thunder Rabbit
Jul 7 '11 at 0:58
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How to attach debugger to iOS app after launch?
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Attach your device connected your Mac
Debug > Attach to Process by PID or Name
In the dialog sheet, enter the name of your app as it appears in the Debug navigator when started via Xcode.
If the app is already running, the debugger will attach to the running proces...
How to set the java.library.path from Eclipse
...and native library locations.
Specifically: select Project, right click -> Properties / Java Build Path / Libraries tab, select a .jar, expand it, select Native library location, click Edit, folder chooser dialog will appear)
Messing with the library path on the command line should be your last...
Best way to store a key=>value array in JavaScript?
What's the best way to store a key=>value array in javascript, and how can that be looped through?
7 Answers
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