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Correct way to use StringBuilder in SQL
...have been 26 to start with, then doubled to 52, then 104, 208, 416, 832, 1664, 3328, and finally 6656). Only significant if this is a hotspot, but still, if you know in advance... :-)
– T.J. Crowder
Jan 4 '12 at 12:24
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NumPy: function for simultaneous max() and min()
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as of numpy 1.8 min and max are vectorized on amd64 platforms,on my core2duo numpy performs as well as this fortran code. But a single pass would be advantageous if the array exceed the size of the larger cpu caches.
– jtaylor
Mar 7 '1...
Do HTML WebSockets maintain an open connection for each client? Does this scale?
...ction consists of destination ip & destination port. That means that ±64k ports limit is actually ONLY for a single client. Theoretically, the server can have any number of open connections, limited ONLY by its hardware.
– Rizon
Dec 21 '13 at 1:35
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With arrays, why is it the case that a[5] == 5[a]?
...t back in the 70's when C was designed, computers didn't have much memory (64KB was a lot), so the C compiler didn't do much syntax checking. Hence "X[Y]" was rather blindly translated into "*(X+Y)"
This also explains the "+=" and "++" syntaxes. Everything in the form "A = B + C" had the same c...
Rails: FATAL - Peer authentication failed for user (PG::Error)
...versions are available
psql=# select VERSION();
PostgreSQL 9.1.13 on x86_64-unk.... # so version is 9.1
Now Open postgres user
vim /etc/postgresql/9.1/main/pg_hba.conf
9.1 is version return form upper command
and replace
local all postgres ...
LINQ to Entities only supports casting EDM primitive or enumeration types with IEntity interface
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64
Some additional explanations regarding the class "fix".
This answer shows two different expres...
Convert a String In C++ To Upper Case
...CII character set.
Speedup comparisons:
Preliminary testing with x86-64 gcc 5.2 -O3 -march=native on a Core2Duo (Merom). The same string of 120 characters (mixed lowercase and non-lowercase ASCII), converted in a loop 40M times (with no cross-file inlining, so the compiler can't optimize away...
How to concatenate two MP4 files using FFmpeg?
...ng them and then trying to encode that concated .ts file. The files are h264 and aac encoded and I'm hoping to keep the quality the same or as close to original as possible.
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Git ignore file for Xcode projects
...ource projects
#
# Apple bugs, waiting for Apple to fix/respond:
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# 15564624 - what does the xccheckout file in Xcode5 do? Where's the documentation?
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# Version 2.6
# For latest version, see: http://stackoverflow.com/questions/49478/git-ignore-file-for-xcode-projects
#
# 2015 updates:
# - Fixed...
HTML5shiv vs Dean Edwards IE7-js vs Modernizr - which to choose?
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64
Modernizr essentially includes the whole of html5shiv.
– Paul Irish
Oct 4 '10 at 15:19
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