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Where can I learn how to write C code to speed up slow R functions? [closed]
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Well there is the good old Use the source, Luke! --- R itself has plenty of (very efficient) C ...
Convert light frequency to RGB?
... color component transfer function is taken from http://www.color.org/srgb.pdf, which
* follows the International Electrotechnical Commission standard IEC 61966-2-1 "Multimedia systems and equipment -
* Colour measurement and management - Part 2-1: Colour management - Default RGB colour space - sR...
Finding quaternion representing the rotation from one vector to another
...k). L67 handles parallel vectors: mathematically unnecessary, but faster. L72 is Polaris878's answer, assuming both vectors are unit length (avoids a sqrt). See also unit tests.
– sinisterchipmunk
Feb 6 '13 at 1:09
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String output: format or concat in C#?
... average of 224ms vs. 48ms, an x4.66 improvement, even better than your x3.72. I wonder if there is a post-compilation tool that can rewrite the IL of string.Format that doesn't use any composite formatting features (i.e. just simple {0}) and replace them with the considerably faster string concaten...
Pelican 3.3 pelican-quickstart error “ValueError: unknown locale: UTF-8”
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asmeurerasmeurer
72.5k2222 gold badges141141 silver badges212212 bronze badges
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How to write header row with csv.DictWriter?
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John MachinJohn Machin
72.5k1010 gold badges116116 silver badges172172 bronze badges
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How to ignore files/directories in TFS for avoiding them to go to central source repository?
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72
It does seem a little cumbersome to ignore files (and folders) in Team Foundation Server. I've ...
How to raise a ValueError?
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John MachinJohn Machin
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node and Error: EMFILE, too many open files
...root 1013u IPv4 151279902 0t0 TCP 10.101.42.209:43656->54.236.3.172:80 (ESTABLISHED)
nodejs 12211 root 1014u IPv4 151317016 0t0 TCP 10.101.42.209:34450->54.236.3.168:80 (ESTABLISHED)
nodejs 12211 root 1015u IPv4 151289728 0t0 TCP 10.101.42.209:52691->54.236....
Need to understand the usage of SemaphoreSlim
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i guess that if i run 50 thread at a time then code like SemaphoreSlim ss = new SemaphoreSli...