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Remove duplicated rows using dplyr
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@dotcomken Until then could also just use df %>% group_by(x, y) %>% do(head(.,1))
– Holger Brandl
Jul 23 '14 at 11:53
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Different results with Java's digest versus external utilities
...s used instead. So same source code, that uses the System32 folder, can be compiled to both 32-bit and 64-bit program code without any changes.
Try copying calc.exe to somewhere else... then run the same tools again. You'll get the same results as Java. Something about the Windows file system is g...
Extract substring using regexp in plain bash
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Environment variables for java installation
...plaining the rationale behind all these environment variables.
Optional recommendations
Add an user environment variable JAVA_TOOL_OPTIONS with value -Dfile.encoding="UTF-8". This ensures that Java (and tools such as Maven) will run with a Charset.defaultCharset() of UTF-8 (instead of the default...
JavaScript style for optional callbacks
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Pablo FernandezPablo Fernandez
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Count how many records are in a CSV Python?
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sam collinssam collins
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How to compare dates in datetime fields in Postgresql?
I have been facing a strange scenario when comparing between dates in postgresql(version 9.2.4 in windows). I have a column in my table say update_date with type 'timestamp without timezone'. Client can search over this field with only date (i.e: 2013-05-03) or date with time (i.e: 2013-05-03 12:20:...
Best way to alphanumeric check in JavaScript
...8) && // numeric (0-9)
!(code > 64 && code < 91) && // upper alpha (A-Z)
!(code > 96 && code < 123)) { // lower alpha (a-z)
return false;
}
}
return true;
};
Of course, there may be other considerations, such as readability....
How to configure Visual Studio to use Beyond Compare
I would like to configure Visual Studio to open Beyond Compare by default as the diff tool. How can I do this?
10 Answers
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