[ublas] how many non-zero entries in row/col of sparse matrix without iteration?

From: Andy Schlaikjer (hazen_at_[hidden])
Date: 2006-08-21 18:30:53

Hi uBLAS list,

I'm working on a few functions to support boost::serialization of 
boost::numeric::ublas::mapped_matrix (including separate template 
specializations for row-major and column-major matrices) and was 
wondering if there were a way for me to access the number of non-zero 
entries in a given row/column of a sparse matrix. Right now I'm 
performing an initial iteration over non-zero entries of a row/col to 
find this number, but was wondering if direct access to this value were 
possible.

Thanks!