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From Sébastien Brisard (JIRA) <j...@apache.org>
Subject [jira] [Resolved] (MATH-802) RealVector.subtract(RealVector) returns wrong answer.
Date Sat, 09 Jun 2012 13:14:43 GMT

     [ https://issues.apache.org/jira/browse/MATH-802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sébastien Brisard resolved MATH-802.
------------------------------------

    Resolution: Fixed
    
> RealVector.subtract(RealVector) returns wrong answer.
> -----------------------------------------------------
>
>                 Key: MATH-802
>                 URL: https://issues.apache.org/jira/browse/MATH-802
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.0
>            Reporter: Sébastien Brisard
>            Assignee: Sébastien Brisard
>             Fix For: 3.1
>
>
> The following piece of code
> {code:java}
> import org.apache.commons.math3.linear.ArrayRealVector;
> import org.apache.commons.math3.linear.OpenMapRealVector;
> import org.apache.commons.math3.linear.RealVectorFormat;
> public class DemoMath {
>     public static void main(String[] args) {
>         final double[] data1 = {
>             0d, 1d, 0d, 0d, 2d
>         };
>         final double[] data2 = {
>             3d, 0d, 4d, 0d, 5d
>         };
>         final RealVectorFormat format = new RealVectorFormat();
>         System.out.println(format.format(new ArrayRealVector(data1)
>             .subtract(new ArrayRealVector(data2))));
>         System.out.println(format.format(new OpenMapRealVector(data1)
>             .subtract(new ArrayRealVector(data2))));
>     }
> }
> {code}
> prints
> {noformat}
> {-3; 1; -4; 0; -3}
> {3; 1; 4; 0; -3}
> {noformat}
> the second line being wrong. In fact, when subtracting mixed types, {{OpenMapRealVector}}
delegates to the default implementation in {{RealVector}} which is buggy.

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