cart-elc

MatrixBase_colwise_iterator_cxx11.cpp (471B)

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 Matrix3i m = Matrix3i::Random();
 cout << "Here is the initial matrix m:" << endl << m << endl;
 int i = -1;
 for(auto c: m.colwise()) {
   c *= i;
   ++i;
 }
 cout << "Here is the matrix m after the for-range-loop:" << endl << m << endl;
 auto cols = m.colwise();
 auto it = std::find_if(cols.cbegin(), cols.cend(),
                        [](Matrix3i::ConstColXpr x) { return x.squaredNorm() == 0; });
 cout << "The first empty column is: " << distance(cols.cbegin(),it) << endl;