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Subject: [ublas] prod function usage
From: Umut Tabak (u.tabak_at_[hidden])
Date: 2011-05-20 07:21:32

Dear all,

I try to use the prod function to multiply a compressed_matrix<double>
with a ublas::vector<double>, however I am getting a segmentation fault
from an assignment like this

Mq = prod( B,q );

where I could not understand the reason of this strange error. I
allocate the space for Mq vector with resize.

If I use prod( B,q ) on a line to evaluate this expression that works
fine however, if I try to assign I am getting a segmentation fault and
the segfault is

Program received signal SIGSEGV, Segmentation fault.
0x000000000040a2a8 in allocate (__n=<value optimized out>, this=<value
optimized out>) at /usr/include/c++/4.4/ext/new_allocator.h:89
89 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));

This product is used in a template function but the above error reminds
me that I have a memory leak and checked my program however with
valgrind that seemed ok.

Any ideas on where I am mistaken?

Best wishes,