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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-848) EigenDecomposition fails for certain matrices
Date Sun, 23 Sep 2012 19:36:07 GMT

     [ https://issues.apache.org/jira/browse/MATH-848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thomas Neidhart resolved MATH-848.
----------------------------------

    Resolution: Fixed

Fixed in revision 1389129.
                
> EigenDecomposition fails for certain matrices
> ---------------------------------------------
>
>                 Key: MATH-848
>                 URL: https://issues.apache.org/jira/browse/MATH-848
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.1
>            Reporter: Thomas Neidhart
>            Assignee: Thomas Neidhart
>             Fix For: 3.1
>
>
> The Schurtransformation of the following matrix fails, which is a preliminary step for
the Eigendecomposition:
> RealMatrix m = MatrixUtils.DEFAULT_FORMAT.parse("{{0.184944928,-0.0646971046,0.0774755812,-0.0969651755,-0.0692648806,0.3282344352,-0.0177423074,0.206313634},{-0.0742700134,-0.028906303,-0.001726946,-0.0375550146,-0.0487737922,-0.2616837868,-0.0821201295,-0.2530000167},{0.2549910127,0.0995733692,-0.0009718388,0.0149282808,0.1791878897,-0.0823182816,0.0582629256,0.3219545182},{-0.0694747557,-0.1880649148,-0.2740630911,0.0720096468,-0.1800836914,-0.3518996425,0.2486747833,0.6257938167},{0.0536360918,-0.1339297778,0.2241579764,-0.0195327484,-0.0054103808,0.0347564518,0.5120802482,-0.0329902864},{-0.5933332356,-0.2488721082,0.2357173629,0.0177285473,0.0856630593,-0.35671263,-0.1600668126,-0.1010899621},{-0.0514349819,-0.0854319435,0.1125050061,0.006345356,-0.2250000688,-0.220934309,0.1964623477,-0.1512329924},{0.0197395947,-0.1997170581,-0.1425959019,-0.274947791,-0.0969467073,0.060368852,-0.2826905192,0.1794315473}}");

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