eigen - How do I invert a dynamic matrix in Eigen?

Question

As far as I can tell, Eigen won't compile if I try to invert a matrix that isn't square. Since the matrix I want to invert is dynamically sized, it doesn't know that both dimensions will be the same, so it won't let me compile it. Is there a way out of this?

Answer 1

Invert is in < Eigen/LU >. I was just using < Eigen/Core >. Alternately, I think < Eigen/Dense > loads the whole library, and would have worked.