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Why does auto a=1; compile in C?
...d d; // actually unsigned int
which is still common in modern code.
C++11 reused the keyword, which few if any C++ programmers were using with the original meaning, for its type inference. This is mostly safe because the "everything is int" rule from C had already been dropped in C++98; the only...
What does “@@ -1 +1 @@” mean in Git's diff output?
...to-file to-file-modification-time
The time stamp looks like 2002-02-21 23:30:39.942229878 -0800 to indicate the date, time with fractional seconds, and time zone. The fractional seconds are omitted on hosts that do not support fractional time stamps.
You can change the header's content wi...
Passing command line arguments to R CMD BATCH
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115
My impression is that R CMD BATCH is a bit of a relict. In any case, the more recent Rscript e...
how to change default python version?
...onfusing that when I type python -V in Terminal it says that Python 2.6.1 , how can I change the default python version?
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In Matlab, when is it optimal to use bsxfun?
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+500
There ...
Ruby: What is the easiest way to remove the first element from an array?
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11 Answers
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What does it mean by select 1 from table?
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15 Answers
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How to write a bash script that takes optional input arguments?
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You could use the default-value syntax:
somecommand ${1:-foo}
The above will, as described in Bash Reference Manual - 3.5.3 Shell Parameter Expansion [emphasis mine]:
If parameter is unset or null, the expansion of word is substituted. Otherwise, the value of parameter is ...
Bubble Sort Homework
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To explain why your script isn't working right now, I'll rename the variable unsorted to sorte...
Python creating a dictionary of lists
...s import defaultdict
>>> d = defaultdict(list)
>>> a = ['1', '2']
>>> for i in a:
... for j in range(int(i), int(i) + 2):
... d[j].append(i)
...
>>> d
defaultdict(<type 'list'>, {1: ['1'], 2: ['1', '2'], 3: ['2']})
>>> d.items()
[(1, ['1']), (...