Re: Not enough work space, increase capacity of C

Ben,
You need to allocate enough storage to C to contain the result of the 
multiplication. I commented on this in my "Evaluation of MTL for GluCat":
http://www.osl.iu.edu/MailArchives/mtl-devel/msg00244.php

"...
3) Need to pre-allocate storage for sparse matrix operations
If you want to create sparse matrices you need to know how much storage they
 will need before you operate on them. This is in contrast to eg. Matlab,
 where a sparse array is extended as needed.

Related bugs:
3.1) Sparse matrix multiply assigns 0 when it runs out of space
Sparse multiply outputs a cryptic message and assigns 0 if not
 enough storage has been assigned to sparse array. Either the message should
 be more informative or there should be an option to tell operations to
 automatically resize, such as an auto-resize policy class.
3.2) Documentation should mention this behaviour of multiply and does not
You either need to expect this as "normal" behaviour, or discover this
 behaviour by using the debugger and examining the source code. ..."

GluCat now uses uBLAS. See http://glucat.sf.net
Best regards

On Thu, 28 Aug 2003 01:42, Benoit Galarneau wrote:
> When running a program based on MTL, we have to following message:
> Not enough work space, increase capacity of C.
> 
> This happens when doing the following: mult(A,B,C) where A, B and C are 
400x400
> sparse matrix. C is initialize with zeros.
> 
> After the multiplication, C only contains zeros.
> 
> Any idea why ?
> 
> Thanks
> 
> Ben
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