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Check for installed packages before running install.packages() [duplicate]
I have an R script that is shared with several users on different computers. One of its lines contains the install.packages("xtable") command.
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PHP: Convert any string to UTF-8 without knowing the original character set, or at least try
I have an application that deals with clients from all over the world, and, naturally, I want everything going into my databases to be UTF-8 encoded.
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Performant Entity Serialization: BSON vs MessagePack (vs JSON)
Recently I've found MessagePack , an alternative binary serialization format to Google's Protocol Buffers and JSON which also outperforms both.
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Exporting data In SQL Server as INSERT INTO
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How do I see the commit differences between branches in git?
I'm on branch-X and have added a couple more commits on top of it. I want to see all the differences between MASTER and the branch that I am on in terms of commits. I could just do a
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How do I exchange keys with values in a dictionary?
I receive a dictionary as input, and would like to to return a dictionary whose keys will be the input's values and whose value will be the corresponding input keys. Values are unique.
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Best approach for GPGPU/CUDA/OpenCL in Java?
General-purpose computing on graphics processing units ( GPGPU ) is a very attractive concept to harness the power of the GPU for any kind of computing.
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Using ls to list directories and their total sizes
Is it possible to use ls in Unix to list the total size of a sub-directory and all its contents as opposed to the usual 4K that (I assume) is just the directory file itself?
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javac : command not found
I have installed java in my CentOS release 5.5 machine using the command yum install java . But I am unable to compile a class using javac.
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Changing all files' extensions in a folder with one command on Windows
How can I use the Windows command line to change the extensions of thousands of files to *****.jpg ?
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