Hi everyone,

Mathematically, A * D only requires multiplying the ith row of A with D_ii. Does the eigen class automatically do this if D is specified as in the Diagonal class?

Sorry if I missed the answer somewhere else.

yes of course! e.g.:

A = A * d.asDiagonal()

will be optimal, i.e., it will perform A.size() multiplications (using SIMD).