大约有 11,600 项符合查询结果（耗时：0.0174秒） [XML]
Passing command line arguments to R CMD BATCH
I have been using R CMD BATCH my_script.R from a terminal to execute an R script. I am now at the point where I would like to pass an argument to the command, but am having some issues getting it working. If I do R CMD BATCH my_script.R blabla then blabla becomes the output file, rather th...
In Python, what is the difference between “.append()” and “+= []”?
What is the difference between:
12 Answers
12
...
Remove duplicate rows in MySQL
I have a table with the following fields:
25 Answers
25
...
What's the best way to inverse sort in scala?
What is the best way to do an inverse sort in scala? I imagine the following is somewhat slow.
9 Answers
...
Bare asterisk in function arguments?
What does a bare asterisk in the arguments of a function do?
6 Answers
6
...
how does multiplication differ for NumPy Matrix vs Array classes?
...o use the function matrixmultipy(). I feel this makes the code very unreadable.
8 Answers
...
Array Size (Length) in C#
How can I determine size of an array (length / number of items) in C#?
9 Answers
9
...
Minimizing NExpectation for a custom distribution in Mathematica
This relates to an earlier question from back in June:
1 Answer
1
...
How to amend older Git commit? [duplicate]
I have made 3 git commits, but have not been pushed.
How can I amend the older one (ddc6859af44) and (47175e84c) which is not the most recent one?
...
Different ways of clearing lists
... doesn't affect other references:
>>> a = [1, 2, 3]
>>> b = a
>>> a = []
>>> print(a)
[]
>>> print(b)
[1, 2, 3]
But this one does:
>>> a = [1, 2, 3]
>>> b = a
>>> del a[:] # equivalent to del a[0:len(a)]
>>> ...