I have the following code:
Eigen::MatrixXf aMatrix( 3, 5 );
aMatrix <<
1, 0, 1, 0, 1,
0, 1, 0, 1, 0,
1, 1, 1, 1, 1;
Eigen::VectorXf aVector( 5 );
aVector << 3, 4, 5, 6, 7;
cout << aMatrix.cwiseProduct( aVector.replicate( 1, aMatrix.rows() ).transpose() ) << endl;
which outputs:
3 0 5 0 7
0 4 0 6 0
3 4 5 6 7
Is there a more efficient way to achieve this than using the replicate()
call?
Solved (with help from: How can I apply bsxfun like functionality at Eigen?)
These are equivalent:
aMatrix.cwiseProduct( aVector.replicate( 1, aMatrix.rows() ).transpose() )
aMatrix.array().rowwise() * aVector.array().transpose()
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