c++ - uBLAS matrix clear memory -

i have ublas matrix, so:

boost::numeric::ublas::matrix<double> mat(50000,50000);

once i'm done set of calculations on matrix, want memory freed.

i have been using mat.clear() which, according docs, "clears matrix". program keeps running out of memory.

digging headers, find this:

void clear () {   std::fill (data ().begin (), data ().end (), value_type/*zero*/()); }

so there's clear semantics problem clear().

the question is, how ensure memory freed?

an inelegant way return memory resizing matrix:

mat.resize(0,0,false);

though have not tried using 0 size value myself...

Three