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## Re: [Help-gsl] hi :-) \o/ I've some problem with eigensystem

**From**: |
Giuseppe Marco Randazzo |

**Subject**: |
Re: [Help-gsl] hi :-) \o/ I've some problem with eigensystem |

**Date**: |
Thu, 22 Apr 2010 17:03:23 +0200 |

**User-agent**: |
KMail/1.13.2 (Linux/2.6.33-gentoo-r1; KDE/4.4.2; x86_64; ; ) |

On Thursday 22 April 2010 10:20:39 tuc wrote:
>* hi*
>* *
>* > So the point of question is this: the*
>* > results that i get have the right values but the signs wrong.*
>* *
>* let A be a square matrix. then a eigenvector v to the eigenvalue a is*
>* defined to have the property:*
>* A*v=a*v.*
>* *
>* therefor for any real number x (nonzero, zero is never an eigenvector)*
>* x*v is also a eigenvector of A:*
>* A*(x*v)=x*(A*v)=x*(a*v)=a*(x*v)*
ok!! i've read now the second example that say:
"Note that the eigenvectors can differ by a change of sign, since the sign of
an eigenvector is arbitrary.
The following program illustrates the use of the nonsymmetric eigensolver,"
ok :) so with this example now the sings are ok! :-)
Thanks for support :-)