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Finding quaternion representing the rotation from one vector to another
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Quaternion q;
vector a = crossproduct(v1, v2);
q.xyz = a;
q.w = sqrt((v1.Length ^ 2) * (v2.Len...
SQL statement to select all rows from previous day
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c# datatable insert column at position 0
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You can use the following code to add column to Datatable at postion 0:
DataColumn Col ...
Return a value if no rows are found in Microsoft tSQL
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实战Nginx与PHP（FastCGI）的安装、配置与优化 - 更多技术 - 清泛网 - 专注...
...，这就是Nginx+FastCGI的整个运作过程。详细的过程，如图1所示。
图1 Nginx+FastCGI运行原理
三、spawn-fcgi与PHP-FPM
前面介绍过，FastCGI接口方式在脚本解析服务器上启动一个或者多个守护进程对动态脚本进行解析，这些进程就...
How do I create a dictionary with keys from a list and values defaulting to (say) zero? [duplicate]
I have a = [1,2,3,4] and I want d = {1:0, 2:0, 3:0, 4:0}
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How can I implode an array while skipping empty array items?
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You can use array_filter():
If no callback is supplied, all entries of input equal to FALSE...
Cron job every three days
Is it possible to run a cronjob every three days? Or maybe 10 times/month.
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Rename specific column(s) in pandas
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edited May 23 '17 at 12:34
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answered Nov 3 '13 at 21:32
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Returning a boolean from a Bash function
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