大约有 40,000 项符合查询结果（耗时：0.0402秒） [XML]
Trimming a huge (3.5 GB) csv file to read into R
... expert at this, but you might consider trying MapReduce, which would basically mean taking a "divide and conquer" approach. R has several options for this, including:
mapReduce (pure R)
RHIPE (which uses Hadoop); see example 6.2.2 in the documentation for an example of subsetting files
Alterna...
Disable password authentication for SSH [closed]
I'm looking for a way to disable SSH clients from accessing the password prompt as noted here .
5 Answers
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App Launcher 应用启动器扩展：用于启动其他应用程序的强大工具，支持独立...
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How to diff one file to an arbitrary version in Git?
...ny of the many other ways of specifying a revision.
Note that this is actually comparing the old pom.xml to the version in your working tree, not the version committed in master. If you want that, then you can do the following instead:
git diff master~20:pom.xml master:pom.xml
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Get class name of object as string in Swift
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Is this really the case? According to the docs for String for this initializer "an unspecified result is supplied automatically by the Swift standard library" when it doesn't conform to Streamable, or CustomStringConvertible, or Cust...
Which is the fastest algorithm to find prime numbers?
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Actually I don't think primegen is the fastest, or even the second-fastest; yafu and primesieve are both faster in general, I think, and certainly over 2^32. Both are (modified) sieves of Eratosthenes rather than the Atkin-Berns...
JavaScript: clone a function
...ly way? I would improve on this a bit so that it does not wrap twice when called twice, but otherwise, ok.
– Andrey Shchekin
Dec 2 '09 at 19:25
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Determine the type of an object?
...object, and isinstance() to check an object’s type against something. Usually, you want to use isistance() most of the times since it is very robust and also supports type inheritance.
To get the actual type of an object, you use the built-in type() function. Passing an object as the only param...
Why does the expression 0 < 0 == 0 return False in Python?
...o say 0 &lt; x &lt;= 5 than to say (0 &lt; x) and (x &lt;= 5).
These are called chained comparisons. And that's a link to the documentation for them.
With the other cases you talk about, the parenthesis force one relational operator to be applied before the other, and so they are no longer chained...
Adding git branch on the Bash command prompt
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git 1.9.3 or later: use __git_ps1
Git provides a shell script called git-prompt.sh, which includes a function __git_ps1 that
prints text to add to bash PS1 prompt (includes branch name)
Its most basic usage is:
$ __git_ps1
(master)
It also takes an optional format string:
$ __g...