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Pandas percentage of total with groupby
... edited May 23 '17 at 11:55
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answered Apr 29 '14 at 23:45
exp1orerexp1orer
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PHP convert XML to JSON
..., concise and easy to maintain. I tested it myself and works pretty well.
http://lostechies.com/seanbiefeld/2011/10/21/simple-xml-to-json-with-php/
<?php
class XmlToJson {
public function Parse ($url) {
$fileContents= file_get_contents($url);
$fileContents = str_replace(a...
How can I do time/hours arithmetic in Google Spreadsheet?
...B2>C2
returns True (1) or False (0), if true 1 day (24 hours) is added.
http://www.excelforum.com/excel-general/471757-calculating-time-difference-over-midnight.html
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Volatile vs. Interlocked vs. lock
...see 'Understand the Impact of Low-Lock Techniques in Multithreaded Apps' - http://msdn.microsoft.com/en-au/magazine/cc163715.aspx
p.s. What prompted this very late reply? All the replies were so blatantly incorrect (especially the one marked as answer) in their explanation I just had to clear it up...
Namespace + functions versus static methods on a class
...ound an online reference to this principle in an article from Herb Sutter: http://www.gotw.ca/gotw/084.htm
The important thing to know is that: In C++ functions in the same namespace as a class belong to that class' interface (because ADL will search those functions when resolving function calls).
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Getting “CHECKOUT can only be performed on a version resource” when trying to commit using Eclipse s
... SVN 1.7 and the Eclipse Subversive plugin. Occassioanlly, when I try and commit changes from my project (by right clicking on the project from the package explorer, selecting "Team" -> "Commit"), I get the error:
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Clearing a string buffer/builder after loop
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I think the performance benefit comes from the string mutability, not from saving the instantiation. here's a quick test of 1e8 iterations: inside loop (2.97s): ideone.com/uyyTL14w, outside loop (2.87s): ideone.com/F9lgsIxh
– Mark Ell...
How to reshape data from long to wide format
... +1 and you don't need to rely on external packages, since reshape comes with stats. Not to mention that it's faster! =)
– aL3xa
May 5 '11 at 0:07
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What are transparent comparators?
...upports calling it with heterogeneous types (e.g. the pointer_comp type in https://stackoverflow.com/a/18940595/981959 is not transparent according to STL's definition, but defining pointer_comp::is_transparent allows it to be used to solve the problem). If you only ever lookup in your std::set<T...
What is the difference between a definition and a declaration?
...bes its type, be it a type, object, or function. A declaration is what the compiler needs to accept references to that identifier. These are declarations:
extern int bar;
extern int g(int, int);
double f(int, double); // extern can be omitted for function declarations
class foo; // no extern allow...