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How to select only the first rows for each unique value of a column
Let's say I have a table of customer addresses:
5 Answers
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Linux find file names with given string
I'm on Ubuntu, and I'd like to find all files in the current directory and subdirectories whose name contains the string "John". I know that grep can match the content in the files, but I have no idea how to use it with file names. Any help would be appreciated.
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src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory
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How to store a git config as part of the repository?
I'm using filters to mangle files during checkout like described here .
Now the problem is that filter definition is only stored in my local configuration file:
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Remove duplicated rows using dplyr
I have a data.frame like this -
6 Answers
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Eclipse and Windows newlines
I had to move my Eclipse workspace from Linux to Windows when my desktop crashed. A week later I copy it back to Linux, code happily, commit to CVS. And alas, windows newlines have polluted many files, so CVS diff dumps the entire file, even when I changed a line or two!
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How to forward declare a template class in namespace std?
and used that function in my main. I get errors. Of course, I know that there are more template params for std::list (allocator I think). But, that is beside the point. Do I have to know the full template declaration of a template class to be able to forward declare it?
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convert pfx format to p12
I need to export a .pfx format certificate (from windows mmc) to .p12 to use in another application. I cant find a way to do this. Can anyone suggest a method?
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How to add “on delete cascade” constraints?
In PostgreSQL 8 is it possible to add ON DELETE CASCADES to the both foreign keys in the following table without dropping the latter?
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Catching all javascript unhandled exceptions
I'm trying to find or figure out a way to display in an alert box all of the unhandled javascript exceptions in an application. I'd want all of this to be done on the client side, without using any server side code. I'm using MVC3 as an environment.
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