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Re: [Help-gsl] AX=B octave vs gsl

From: Awhan Patnaik
Subject: Re: [Help-gsl] AX=B octave vs gsl
Date: Wed, 15 Sep 2010 08:02:59 +0530

On Sat, Sep 11, 2010 at 2:14 PM, Brian Gough <address@hidden> wrote:
> At Wed, 8 Sep 2010 08:01:23 +0530,
> Awhan Patnaik wrote:
>> What can I do to get as much accuracy as the Octave method?
> Did you compute the norm from the printed output data or the data in
> memory? Note that it is only printed to 7 digits, so you would lose
> ~11 digits of precision in that case.

That is precisely where I was going wrong. The loss of significant
digits while transferring data to Octave through a data file resulted
in the loss of accuracy. When the norm is computed in the C++ code all
is right. Many thanks to Francesco Abbate for helping me in this.

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