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Performance of Java matrix math libraries? [closed]
...s. I've compared some of these libraries. I attempted to matrix multiply a 3000 by 3000 matrix of doubles with itself. The results are as follows.
Using multithreaded ATLAS with C/C++, Octave, Python and R, the time taken was around 4 seconds.
Using Jama with Java, the time taken was 50 seconds.
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Comma in C/C++ macro
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edited Sep 23 '16 at 14:57
answered Dec 12 '12 at 15:16
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Getting the path of the home directory in C#?
...turns the My Documents folder. The safest way to get the home folder on Win32 is to read %HOMEDRIVE%%HOMEPATH%. Reading environment variables is actually very portable to do (across Unix and Windows), so I'm not sure why the poster wanted to not do it.
Edited to add: For crossplatform (Windows/Unix...
Convert Unix timestamp to a date string
...ith GNU's date you can do:
date -d "@$TIMESTAMP"
# date -d @0
Wed Dec 31 19:00:00 EST 1969
(From: BASH: Convert Unix Timestamp to a Date)
On OS X, use date -r.
date -r "$TIMESTAMP"
Alternatively, use strftime(). It's not available directly from the shell, but you can access it via gawk. T...
How to cut an entire line in vim and paste it?
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Dillon Davis
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answered Mar 27 '13 at 7:35
Programmer123123P...
Task continuation on UI thread
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353
Call the continuation with TaskScheduler.FromCurrentSynchronizationContext():
Task UITask...
git pull while not in a git directory
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Starting git 1.8.5 (Q4 2013), you will be able to "use a Git command, but without having to change directories".
Just like "make -C <directory>", "git -C <directory> ..." tells Git to go there before doing anything else.
See commit 4...
Structure padding and packing
...boundaries - say, int members would have offsets, which are mod(4) == 0 on 32-bit platform. Padding is on by default. It inserts the following "gaps" into your first structure:
struct mystruct_A {
char a;
char gap_0[3]; /* inserted by compiler: for alignment of b */
int b;
char c;
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how to reset
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394
The jQuery solution that @dhaval-marthak posted in the comments obviously works, but if you lo...
Is a Java hashmap search really O(1)?
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edited Nov 23 '15 at 0:59
worldofjr
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