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How to convert a data frame column to numeric type?

How do you convert a data frame column to a numeric type? 18 Answers 18 ...
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check if directory exists and delete in one command unix

Is it possible to check if a directory exists and delete if it does,in Unix using a single command? I have situation where I use ANT 'sshexec' task where I can run only a single command in the remote machine. And I need to check if directory exists and delete it... ...
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What is the canonical way to check for errors using the CUDA runtime API?

Looking through the answers and comments on CUDA questions, and in the CUDA tag wiki , I see it is often suggested that the return status of every API call should checked for errors. The API documentation contains functions like cudaGetLastError , cudaPeekAtLastError , and cudaGetErrorString , b...
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How to default to other directory instead of home directory

I am developing on a windows machine. The only place I need for linux command line is Git Bash. The problem is: When I open it, I am in the home directory. I have to change the directory to my workspace, like: ...
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How to convert an Int to a String of a given length with leading zeros to align?

...n I convert an Int to a 7-character long String , so that 123 is turned into "0000123" ? 7 Answers ...
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How to find all combinations of coins when given some dollar value

I found a piece of code that I was writing for interview prep few months ago. 35 Answers ...
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Running Python on Windows for Node.js dependencies

I am getting into a Node.js codebase which requires that I download a few dependencies via NPM, namely jQuery. 22 Answers ...
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How does Java handle integer underflows and overflows and how would you check for it?

How does Java handle integer underflows and overflows? 12 Answers 12 ...
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Intersection of two lists in Bash

I'm trying to write a simple script that will list the contents found in two lists. To simplify, let's use ls as an example. Imagine "one" and "two" are directories. ...
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Define make variable at rule execution time

In my GNUmakefile, I would like to have a rule that uses a temporary directory. For example: 4 Answers ...