I would like to deallocate the memory for a matrix before the scope of that variable is ended. I have seen that there is no free() or clear() or erase() or any other explicit function available in Eigen to do that ?

I think the solution to that is to do myMatrix.resize(0,0)

but I would like to know if there is another better way ? and if NOT, then I hope nothing bad happens when the variable goes out of scope with size=0 !!?

Thanks

resize(0,0) is the only way to do that, and nothing bad happens when the matrix goes out of scope.