
Ublas : 
Subject: Re: [ublas] How to understand the meanings of the member function index1() and index2() in the iterator of compressed_matrix
From: éåŽç¥Ž (huayiwei1984_at_[hidden])
Date: 20101112 20:52:08
Hi, Rutger,
Thanks for your help. In my program, I want to access the entries of
sparse matrix M as following:
typename ublas::compressed_matrix<double, ublas::row_major> ::iterator1 row;
// Iterator over rows
typename ublas::compressed_matrix<double, ublas::row_major> ::iterator2
entry; // Iterator over entries
for (row = M.begin1();row != M.end1(); ++row) {
unit& i1 = row.index1(); // the row index
unit& j1 = row.index2(); // the column index for which one of the
elements of M ? Is it the beginning element of row?
for (entry = row.begin(); entry != row.end(); ++entry) {
unit& i2 = entry.index1(); // the row index of element pointed by
entry
unit& j2 = entry.index2(); // the column index of element pointed
by entry
}
}
Best
Huayi