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Performance of Java matrix math libraries? [closed]
...lying two dense matrices, ie:
import static jeigen.MatrixUtil.*;
int K = 100;
int N = 100000;
DenseMatrix A = rand(N, K);
DenseMatrix B = rand(K, N);
Timer timer = new Timer();
DenseMatrix C = B.mmul(A);
timer.printTimeCheckMilliseconds();
Results:
Jama: 4090 ms
Jblas: 1594 ms
Ojalgo: 2381 ms (...
Why is the use of alloca() not considered good practice?
...tion.
In the header file:
void DoSomething() {
wchar_t* pStr = alloca(100);
//......
}
In the implementation file:
void Process() {
for (i = 0; i < 1000000; i++) {
DoSomething();
}
}
So what happened was the compiler inlined DoSomething function and all the stack allocatio...
Is there a built in function for string natural sort?
...
The X usages mentioned by @Claudiu seem to be 100 on Python 2.7 and 512 on Python 3.4. And also note that when the limit is reached the cache is completely cleared (so it's not only the oldest one that is thrown out).
– Zitrax
Nov 2...
Converting file size in bytes to human-readable string
...
function humanFileSize(bytes, si=false, dp=1) {
const thresh = si ? 1000 : 1024;
if (Math.abs(bytes) < thresh) {
return bytes + ' B';
}
const units = si
? ['kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
: ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB...
Is there a recommended way to return an image using ASP.NET Web API
...of serving static files. IIS does an extremely good job of that - Often 20-100x more efficiently.
If you want to get good performance, do URL rewriting at the latest during PostAuthorizeRequest, so IIS can pick up and serve the file. Yes, this means HttpModule-level event handling.
[Disclaimer: ...
Finding JavaScript memory leaks with Chrome
...snapshot of the jsfiddle, before I click 'Remove', there are far more than 100,000 objects present. Where would I look for the objects that my jsfiddle's code actually created? I thought the Window/http://jsfiddle.net/4QhR2/show might be useful, but it's just endless functions. I have no idea what's...
LaTeX: Prevent line break in a span of text
...
Define myurl command:
\def\myurl{\hfil\penalty 100 \hfilneg \hbox}
I don't want to cause line overflows,
I'd just rather LaTeX insert linebreaks before
\myurl{\tt http://stackoverflow.com/questions/1012799/}
regions rather than inside them.
...
How to extract a string using JavaScript Regex?
...
100
function extractSummary(iCalContent) {
var rx = /\nSUMMARY:(.*)\n/g;
var arr = rx.exec(iCa...
Random record from MongoDB
I am looking to get a random record from a huge (100 million record) mongodb .
26 Answers
...
How do I check if a given string is a legal/valid file name under Windows?
...
100
You can get a list of invalid characters from Path.GetInvalidPathChars and GetInvalidFileNameC...