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Why were pandas merges in python faster than data.table merges in R in 2012?
...re-computed indexes for various columns to accelerate operations like data selection and merges. In this case (database joins) pandas' DataFrame contains no pre-computed information that is being used for the merge, so to speak it's a "cold" merge. If I had stored the factorized versions of the join...
Use of undeclared identifier 'kUTTypeMovie'
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Add MobileCoreServices.framework if not added already. Select your target and add linked binaries with library.
Add #import <MobileCoreServices/MobileCoreServices.h>
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How to invert a grep expression
... grep help text:
grep --help | grep invert
-v, --invert-match select non-matching lines
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What's the best way to do a backwards loop in C/C#/C++?
...t, the problem with this approach is that an iterator doesn't allow you to selectively pick out items of the array - consider the situation where you wanted to navigate through a portion of an Array, but not the entire thing...
– jesses.co.tt
Feb 17 '16 at 21:5...
Difference between shared objects (.so), static libraries (.a), and DLL's (.so)?
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FYI: g++ has __attribute__ syntax for selectively 'export' symbols: #define DLLEXPORT __attribute__ ((visibility("default"))) #define DLLLOCAL __attribute__ ((visibility("hidden")))
– Brian Cannard
Jul 10 '14 at 14:49
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Difference between Covariance & Contra-variance
...vide so-called “multiple dispatch” or multi methods (this is basically selecting function overloads at run time, e.g. with CLOS) or get the desired effect by using dynamic typing.
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When should I use malloc in C and when don't I?
...y, but of course you don't know the file's size in advance, since the user selects the file on the spot, at runtime. So basically you need malloc when you don't know the size of the data you're working with in advance. At least that's one of the main reasons for using malloc. In your example with a ...
What are the most widely used C++ vector/matrix math/linear algebra libraries, and their cost and be
...s criteria, but if maturity were the only metric, I imagine you would have selected a BLAS or LAPACK based option.
– Catskul
Sep 9 '09 at 17:54
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:active pseudo-class doesn't work in mobile safari
...ed if the page is scrolled. In light of this, I suggest using this only on select elements. In my case, I am developing a web-app for use out in the field which is basically a list of buttons to navigate pages and submit actions. Because the whole page is pretty much buttons in some cases, this won'...
std::function vs template
... in cases with binding, there's a chunk of code which does the adaptation, selected by a code ptr in the function obj, and which picks up data (bound parms) from the function obj (d) the 'bound' function may be inlined into that adaptor, if the compiler can see it.
– greggo
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