Hello,

I'm trying to modify diagonal values of Sparse Matrix:

Code: Select all

// AtA - Sparse Matrix

AtA.diagonal() += 100; // doesn't work

VectorXf diagonal = VectorXf::Ones(10000) * 100;
AtA += diagonal.asDiagonal(); // doesn't work as well


What is the way to add constant Scalar to all diagonal values?
If some diagonal values are missing it should be added and set to Scalar.

This should work:

AtA.diagonal().array() += constant;