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Can dplyr package be used for conditional mutating?
Can the mutate be used when the mutation is conditional (depending on the values of certain column values)?
5 Answers
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Key hash for Android-Facebook app
...ook-Android SDK, and I got
the readme.md (text file) in there, in which it is mentioned to generate
the key hash for Android. How do I generate it?
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How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?
How can I tell if the JVM in which my application runs is 32 bit or 64-bit? Specifically, what functions or properties I can used to detect this within the program?
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When does System.gc() do something?
I know that garbage collection is automated in Java. But I understood that if you call System.gc() in your code that the JVM may or may not decide to perform garbage collection at that point. How does this work precisely? On what basis/parameters exactly does the JVM decide to do (or not do) a GC ...
Markdown to create pages and table of contents?
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MultiMarkdown Composer does seem to generate a table of contents to assist while editing.
There might also be the one or the other library, who can generate TOCs: see Python Markdown TOC Extension.
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Asp.net MVC ModelState.Clear
...VC (or a link to one). In particular I need to know in what situations it is necessary or desirable to call ModelState.Clear() .
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How to fix “Referenced assembly does not have a strong name” error?
I've added a weakly named assembly to my Visual Studio 2005 project (which is strongly named). I'm now getting the error:
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Insert code into the page context using a content script
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Underlying cause:
Content scripts are executed in an "isolated world" environment.
Solution::
To access functions/variables of the page context ("main world") you have to inject the code that wants to access them into the page itself. Same thing if you want to expose your functi...
What is the easiest way to get current GMT time in Unix timestamp format?
...calendar ) as can be seen here in order to deal with time. I made a big mistake by using the following to get current GMT time time.mktime(datetime.datetime.utcnow().timetuple())
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How to put space character into a string name in XML?
...e between some numbers in the string. When I type extra space characters this is not showing on the application though.
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