R: help on Octave

[Pierpaolo]

Hi,

I followed your advice and now, using sparse matrix, I saved a lot of memory.

 

But now with sparse matrix I get

“warning: matrix singular to machine precision, rcond = 1

warning: attempting to find minimum norm solution”

evaluating this code:

[L,U]=lu(A);

C=U\(L\(B));

where A,B are sparse matrix

 

What does it mean?

 

With A,B full matrix I have not this warning

 

Thanks a lot

 

Pierpaolo