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Apply a function to every row of a matrix or a data frame
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You simply use the apply() function:
R> M <- matrix(1:6, nrow=3, byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extr...
Are PHP include paths relative to the file or the calling code?
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133
It's relative to the main script, in this case A.php. Remember that include() just inserts code...
tcp端口状态ESTABLISHED、TIME_WAIT、CLOSE_WAIT 、SYN_RECV等详解 - C/C++...
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ESTABLISHED的意思是建立连接。表示两台机器正在通信。
3、CLOSE_WAIT
对方主动关闭连接或者网络异常导致连接中断，这时我方的状态会变成CLOSE_WAIT 此时我方要调用close()来使得连接正确关闭
4、TIME_WAIT
我方主动调用close()断开...
ObjectiveC Parse Integer from String
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edited Mar 1 '13 at 17:15
answered Aug 25 '10 at 17:36
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In-place edits with sed on OS X
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edited May 31 '19 at 11:51
Eduardo Cuomo
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'ssh-keygen' is not recognized as an internal or external command
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133
2012:
ssh-keygen.exe is part of msysgit:
C:\path\to\msysgit1.7.11\bin\ssh-keygen.exe
if you...
How does Python manage int and long?
...ns back. Before that it was possible to overflow an int through math ops.
3.x has further advanced this by eliminating long altogether and only having int.
Python 2: sys.maxint contains the maximum value a Python int can hold.
On a 64-bit Python 2.7, the size is 24 bytes. Check with sys.getsize...
Can I mix Swift with C++? Like the Objective-C .mm files
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13 Answers
13
Active
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What is the alternative for ~ (user's home directory) on Windows command prompt?
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342
You're going to be disappointed: %userprofile%
You can use other terminals, though. Powershel...
LISTAGG in Oracle to return distinct values
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edited Apr 13 '19 at 23:57
Jon Heller
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