[eigen] Getting the nonzero coefficient of a sparse matrix

[Cedric Doucet <cedric.doucet@xxxxxxxx>]

Hello!

I would like to get the value of a nonzero coefficient of a sparse matrix which has been passed as a const argument in a function.

However, I don't manage to do it because coeffRef function discards cv-qualifiers when I try to use it.

Is there a way to do it anyway?

Cédric