https://root.cern.ch/root/html604/TMatrixT_double_.html#TMatrixT_double_:Mult
says
General matrix multiplication. Create a matrix C such that C = A * B.
What is this mysterious matrix C? In other words how can I get a result of matrix multiplication?
TMatrixD C;
C.Mult(A*B); ?
Why isn’t there a * operator defined for TMatrix (TMatrixD C = A*B)?