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php动态安装mysql扩展错误（ext/mysqlnd/mysqlnd.h: No such file or direc...
...lnd/mysqlnd.h: No such file or directory）错误如下：In file included from data xingzheng install php-5.5.10 include php Zend zend_compile.h:719, from ...错误如下：
In file included from /data/xingzheng/install/php-5.5.10/include/php/Zend/zend_compile.h:719,
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“message failed to fetch from registry” while trying to install any module
I can't install any node module from the npm.
14 Answers
14
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Shell script - remove first and last quote (") from a variable
Below is the snippet of a shell script from a larger script. It removes the quotes from the string that is held by a variable. I am doing it using sed, but is it efficient? If not, then what is the efficient way?
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Remove the last character from a string [duplicate]
What is fastest way to remove the last character from a string?
4 Answers
4
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How to delete multiple values from a vector?
...s.na (remove)))
a <- a [! is.na (a)]
(This does not distinguish NA from NaN but the R manual anyways warns that one should not rely on having a difference between them)
For Inf/ -Inf you'll have to check both sign and is.finite
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What is the advantage of using abstract classes instead of traits?
What is the advantage of using an abstract class instead of a trait (apart from performance)? It seems like abstract classes can be replaced by traits in most cases.
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Threading pool similar to the multiprocessing Pool?
...t is hidden somewhat and not properly documented.
It can be imported via
from multiprocessing.pool import ThreadPool
It is implemented using a dummy Process class wrapping a python thread. This thread-based Process class can be found in multiprocessing.dummy which is mentioned briefly in the do...
Delete all documents from index/type without deleting type
I know one can delete all documents from a certain type via deleteByQuery.
15 Answers
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Use cases for NoSQL [closed]
...scale will be much simpler.
As a Joomla founder I'm biased :-) but coming from the CMS space, something like MongoDB is a silver bullet as content maps very naturally to document systems.
Another great case for MongoDB is real-time analytics, as MongoDB has very strong performance and scale partic...
How to read a single character from the user?
Is there a way of reading one single character from the user input? For instance, they press one key at the terminal and it is returned (sort of like getch() ). I know there's a function in Windows for it, but I'd like something that is cross-platform.
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