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From "Wilhelm Burger (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (MATH-1390) LUDecomposition slow on larger matrices
Date Sat, 26 Nov 2016 09:53:58 GMT

    [ https://issues.apache.org/jira/browse/MATH-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15697660#comment-15697660
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Wilhelm Burger edited comment on MATH-1390 at 11/26/16 9:53 AM:
----------------------------------------------------------------

A proposed fix has been submitted with this pull request: 
https://github.com/apache/commons-math/pull/45

The associated repo is here:
https://github.com/WilhelmBurger/commons-math/tree/improvement-MATH-1390

--Wilhelm


was (Author: wilbur):
A proposed fix has been placed here: 
https://github.com/WilhelmBurger/commons-math/tree/improvement-MATH-1390

--Wilhelm

> LUDecomposition slow on larger matrices
> ---------------------------------------
>
>                 Key: MATH-1390
>                 URL: https://issues.apache.org/jira/browse/MATH-1390
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 4.0, 3.7
>            Reporter: Wilhelm Burger
>            Priority: Minor
>              Labels: performance
>             Fix For: 4.0, 3.7
>
>   Original Estimate: 6h
>  Remaining Estimate: 6h
>
> Commons-math LUDecomposition runs ca. 10 times slower than the original (referenced)
JAMA implementation for a matrix of size 1600 x 1600, slowdown is noticable above size 750
x 750, regardless of matrix type.
> It is suggested to revert to the proven (and fast) JAMA implementation and overhaul the
LUDecomposition class (and related classes) in the 'linear' package.



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