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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MATH-289) SimplexTableau's arrayCopy could be wrong
Date Thu, 27 Aug 2009 07:58:59 GMT

     [ https://issues.apache.org/jira/browse/MATH-289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-289.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 2.1

fixed in subversion repository as of r808311
thanks for the report

> SimplexTableau's arrayCopy could be wrong
> -----------------------------------------
>
>                 Key: MATH-289
>                 URL: https://issues.apache.org/jira/browse/MATH-289
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 2.0
>         Environment: Java 1.6.0_13 on Windows XP 32-bit 
>            Reporter: Andrea
>            Priority: Minor
>             Fix For: 2.1
>
>         Attachments: SimplexTableau.patch
>
>
> The private method copyArray in file SimplexTableau at line 329 takes 3 parameters src,
dest and destPos but the last one is never used/read.
> private void copyArray(final double[] src, final double[] dest, final int destPos) {
>     System.arraycopy(src, 0, dest, getNumObjectiveFunctions(), src.length); 
> }
> The behavior of this method doesn't reflect its JavaDoc description, and "misleads" createTableau
at line 157 that passes 1 as destPos.
> I don't think this leads to a wrong result, but the method signature/implementation is
misleading for a future reuse.
> I suggest either to remove the destPos argument or use it in the method body.

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