[Boost-users] uBLAS sparse_matrix "default" value

From: Austin Bingham (austin.bingham_at_[hidden])
Date: 2005-02-01 10:33:57

Apparently the wheels of the ublas mailing list move slowly, so I'm
asking this question here.

Is there any way to set the "default" value of a sparse_matrix?
sparse_matrix seems to guarantee that you always get a value when you
access an index, even if that index hasn't been explicitly set. For
sparse_matrix<float>, for instance, you get 0. Is there any way to
specify this value? That is, if I wanted to get back, say, -1 for
unset entries, is there a way to do this? There's no direct mention of
this that I can find, although there were some discussions of
zero-constructors or somesuch that may have been dealing with this
question. Thanks.

Austin Bingham