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> But I still did not understand the reasoning in the codes of ublas where (it seems) 
> there is not a check for the completion of the fill of the elements of a matrix...
Hmmm, I don't understand your statement. Sorry. Anyway ...
> I wrote a matrix market interface to export matrices to MATLAB however I iterate 
> over the nonzeros now, which is pretty fast,
I would also prefer to iterate over the nonzeros with appropiate iterators. That's 
'cleaner' than working directly with the underlying arrays. 
Are you doing the FE assembly process with a compressed matrix? If so, check 
Gunter's hompepage for faster alternatives (general vector of vectors or so).
Ciao 
Ralf 
  
 
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