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Convert columns to string in Pandas
...dability
This is self-explanatory ;-)
OK, so should I stop using it right now?
...No. As of writing this answer (version 1.1), there are no performance benefits but the docs expect future enhancements to significantly improve performance and reduce memory usage for "string" columns as opposed to ob...
Pure JavaScript equivalent of jQuery's $.ready() - how to call a function when the page/DOM is ready
With jQuery, we all know the wonderful .ready() function:
10 Answers
10
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Is Ruby pass by reference or by value?
... Ruby is pass-by-value. No ifs. No buts. No exceptions. If you want to know whether Ruby (or any other language) is pass-by-reference or pass-by-value, just try it out: def foo(bar) bar = 'reference' end; baz = 'value'; foo(baz); puts "Ruby is pass-by-#{baz}".
– Jörg W Mitt...
Most underused data visualization [closed]
...to plot 3D scatter plots using rgl.
GGobi
Another package that is worth knowing is rggobi. There is a Springer book on the subject, and lots of great documentation/examples online, including at the "Looking at Data" course.
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What Content-Type value should I send for my XML sitemap?
...ation/xml the character encoding can be specified in the document itself.
Now a rule of thumb on the internet is: “Be strict with the output but be tolerant with the input.” That means make sure to meet the standards as much as possible when delivering data over the internet. But build in some ...
Choice between vector::resize() and vector::reserve()
... seconds. Then I refactored the code using pre-allocation with .reserve(), now it takes 3 seconds. Just putting a .reserve(100000) in the beginning of the code saved 27 seconds.
– deniz
Oct 12 '13 at 7:25
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Difference between natural join and inner join
... is the least-important aspect of a natural join. The things you need to know are (A) it automatically joins on fields of the same name and (B) it will f*** up your s*** when you least expect it. In my world, using a natural join is grounds for dismissal.
– user565869
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What's the difference between size_t and int in C++?
...can't be a structure. I don't have a reference handy to back this up right now, though.
– unwind
Feb 2 '09 at 11:57
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Evaluating a mathematical expression in a string
... stack.get()
if func not in safe:
raise TypeError("Function %r now allowed"%func)
stack.put(func(*args))
def LOAD_CONST(context, arg):
cons = arg[0]+arg[1]*256
stack.put(context['code'].co_consts[cons])
def LOAD_NAME(context, arg):
name_num = arg[0]+arg[1]*256
name ...
MySQL - ORDER BY values within IN()
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Careful. Any unknown property value (not in the list) will take precedence over the known values, i.e. FIELD(letter, 'A', 'C'), the list will first return entries with B letter first (assuming a set of records with A | B | C values). To avoi...