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 :-) _______________________________________________ Help-gsl mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-gsl
