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Process all arguments except the first one (in a bash script)
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edited May 23 '17 at 10:31
Community♦
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answered Jan 29 '12 at 22:32
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What does the tilde (~) mean in my composer.json file?
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fatal error: Python.h: No such file or directory
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2381
Looks like you haven't properly installed the header files and static libraries for python dev...
Remove all values within one list from another list? [duplicate]
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>>> a = range(1, 10)
>>> [x for x in a if x not in [2, 3, 7]]
[1, 4, 5, 6, 8, 9]
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程序员之网络安全系列（二）：如何安全保存用户密码及哈希算法 - 更多技术 ...
...码试一下上面的第二点 （MD5是一种常用的Hash算法)
2.2.3 :003 > require 'digest/md5.so'
=> true
2.2.3 :004 > puts Digest::MD5.hexdigest('I love you')
e4f58a805a6e1fd0f6bef58c86f9ceb3
=> nil
2.2.3 :005 > puts Digest::MD5.hexdigest('I love you!')
690a8cda8894e37a6fff4d1790d53b...
Pass a data.frame column name to a function
... just use the column name directly:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 <- function(x, column){
max(x[,column])
}
fun1(df, "B")
fun1(df, c("B","A"))
There's no need to use substitute, eval, etc.
You can even pass the desired function as a parameter:
fun1 <- function(x, colu...
How do I install Python OpenCV through Conda?
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edited Jun 30 '17 at 10:00
Quanlong
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Why am I getting a “401 Unauthorized” error in Maven?
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JohnJohn
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How to select rows from a DataFrame based on column values?
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4135
To select rows whose column value equals a scalar, some_value, use ==:
df.loc[df['column_name'...
Cartesian product of x and y array points into single array of 2D points
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