大约有 42,000 项符合查询结果（耗时：0.0640秒） [XML]
Selecting only numeric columns from a data frame
Suppose, you have a data.frame like this:
11 Answers
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An efficient way to transpose a file in Bash
I have a huge tab-separated file formatted like this
29 Answers
29
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What are some good resources for learning about Artificial Neural Networks? [closed]
I'm really interested in Artificial Neural Networks, but I'm looking for a place to start.
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What does the “===” operator do in Ruby? [duplicate]
I've seen it used a few times lately but can't figure out what it does. Can anyone illustrate how it works?
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When is JavaScript synchronous?
I have been under the impression for that JavaScript was always asynchronous. However, I have learned that there are situations where it is not (ie DOM manipulations). Is there a good reference anywhere about when it will be synchronous and when it will be asynchronous? Does jQuery affect this at...
Powershell equivalent of bash ampersand (&) for forking/running background processes
In bash the ampersand (&) can be used to run a command in the background and return interactive control to the user before the command has finished running. Is there an equivalent method of doing this in Powershell?
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Ruby regular expression using variable name
Is is possible to create/use a regular expression pattern in ruby that is based on the value of a variable name?
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Can Go compiler be installed on Windows?
I've been looking on golang.org for a Windows compiler, but I can't seem to find it. I can only see Linux and OS X compilers. Does anyone know if Go programming can be done on Windows, or is it something that Google hasn't implemented yet?
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When should I use nil and NULL in Objective-C?
This is sample code:
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Practical uses for AtomicInteger
I sort of understand that AtomicInteger and other Atomic variables allow concurrent accesses. In what cases is this class typically used though?
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