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How to change column datatype from character to numeric in PostgreSQL 8.4
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Detect if homebrew package is installed
I'm about to write a shell script to detect if several homebrew packages are installed in the system. Is there a way to use a brew command to achieve that?
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pandas: multiple conditions while indexing data frame - unexpected behavior
I am filtering rows in a dataframe by values in two columns.
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How do I list the symbols in a .so file
How do I list the symbols being exported from a .so file? If possible, I'd also like to know their source (e.g. if they are pulled in from a static library).
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How to get the max of two values in MySQL?
I tried but failed:
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Spring: how do I inject an HttpServletRequest into a request-scoped bean?
I'm trying to set up a request-scoped bean in Spring.
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Express res.sendfile throwing forbidden error
I have this code:
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How to avoid warning when introducing NAs by coercion
I generally prefer to code R so that I don't get warnings, but I don't know how to avoid getting a warning when using as.numeric to convert a character vector.
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What is Python buffer type for?
There is a buffer type in python, but I don't know how can I use it.
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What is the difference between `-fpic` and `-fPIC` gcc parameters?
I've already read the gcc manpage, but I still can't understand the difference between -fpic and -fPIC . Can someone explain it, in a very simple and clear way?
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