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[Help-gsl] lssolve precision

From: potda
Subject: [Help-gsl] lssolve precision
Date: Mon, 25 May 2009 11:04:17 +0200

   Hello!   I'm writing my final thesis about Image compressing. In the 
algorithm I use the gsl_linalg_QR_lssolve routine to find whether a quadrant of 
the image can be linearly expressed by a basis.The number of rows in the matrix 
A ( from the A*x=b problem)  is greater or equal to the number of 
columns.Otherwise we can not assume nothing about it except that the values are 
between 0 and 255 and are integers.   The problem is that the precision of the 
solution is not satisfying therefore on images greater than 128x128 pixels 
appears some unwanted pixels. It looks like the greater is the basis ( which 
means that A has more cols,  more than 100) the more errors i find. Can I 
achieve a more precise solution using the gsl library? Which method should I 
use? Maybe I should somehow manipulate matrix A (normalize or whatever)?   
Thank You!   Daniel    

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