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Re: [Help-gsl] Strange gsl_blas_dsymv() behaviour

From: Frank Reininghaus
Subject: Re: [Help-gsl] Strange gsl_blas_dsymv() behaviour
Date: Tue, 19 Feb 2008 12:48:11 +0100


2008/2/16, Korusef <address@hidden>:
> Hi, I was trying to use GSL for matrix/vector multiplication but strange
> error occurred and I received different results than I expected.

I don't quite understand why you expect only three different entries in the
result vector of the multiplication. Your matrix J does *NOT* have squares
with the value 801900 around the diagonal as you said, but 9 diagonals
containing this value on both sides of the main diagonal. Therefore, it is
quite clear that you get lots of different entries in your result vector.

Hope I could help you!

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