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Re: [Help-gsl] lssolve precision

From: potda
Subject: Re: [Help-gsl] lssolve precision
Date: Wed, 27 May 2009 18:56:59 +0200

  Hello!   The matrix was ill-conditioned.That was the reason, not the 
precision.Sorry, I'm just learning LA.   Have a nice day!   Daniel -- Eredeti 
üzenet -- Feladó: address@hidden Címzett: address@hidden Elküldve: 2009. május 
25. 11:4 Tárgy : [Help-gsl] lssolve precision 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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