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Append TimeStamp to a File Name
... I would like to have multiple versions of the same file in the same directory. The way I have been doing it using C# is by adding a time stamp to the file name with something like this DateTime.Now.ToString().Replace('/', '-').Replace(':', '.') .
Is there a better way to do this?
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Can pandas automatically recognize dates?
...ositively surprised by the fact that while reading data from a data file (for example) pandas is able to recognize types of values:
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How are GCC and g++ bootstrapped?
This has been bugging me for a while. How do GCC and g++ compile themselves?
1 Answer
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Numpy: Divide each row by a vector element
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Here you go. You just need to use None (or alternatively np.newaxis) combined with broadcasting:
In [6]: data - vector[:,None]
Out[6]:
array([[0, 0, 0],
[0, 0, 0],
[0, 0, 0]])
In [7]: data / vector[:,None]
Out[7]:
array([[1, 1, 1],
[1, 1, 1],...
Effects of the extern keyword on C functions
In C, I did not notice any effect of the extern keyword used before function declaration.
At first, I thought that when defining extern int f(); in a single file forces you to implement it outside of the file's scope. However I found out that both:
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What is the difference between null and undefined in JavaScript?
...defined // true
null === null // true
and
null = 'value' // ReferenceError
undefined = 'value' // 'value'
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How to replace a string in multiple files in linux command line
... systems like macOS, you need to provide a backup extension like -i '.bak' or else "risk corruption or partial content" per the manpage.
cd /path/to/your/folder
sed -i '.bak' 's/foo/bar/g' *
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JavaScript to scroll long page to DIV
...yone finds this through google (as I did) and who does not want to use anchors or jquery; there's a builtin javascriptfunction to 'jump' to an element;
document.getElementById('youridhere').scrollIntoView();
and what's even better; according to the great compatibility-tables on quirksmode, this i...
Mocking vs. Spying in mocking frameworks
In mocking frameworks, you can mock an object or spy on it. What's the difference between the two and when would/should I use one over the other?
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C++11 emplace_back on vector?
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For anyone from the future, this behavior will be changed in C++20.
In other words, even though implementation internally will still call T(arg0, arg1, ...) it will be considered as regular T{arg0, arg1, ...} that you would e...