I want to create a sign matrix from a dense matrix. A sign matrix S of a matrix A is one with coefficients +1 or -1, depending on whether the corresponding coeffs in A is positive or negative, i.e.

S(i,j) = 1 if A(i,j)>0 else S(i,j) = -1

I thought I could do this to generate one:
Eigen::MatrixXd A(n, m);
// initialize entries
Eigen::MatrixXi S(n, m);
S = (A.cwiseQuotient(A.cwiseAbs())).cast<Eigen::MatrixXi>();

but it refuses to compile with YOU_MIXED_DIFFERENT_NUMERIC_TYPES__YOU_NEED_TO_USE_THE_CAST_METHOD_OF_MATRIXBASE_TO_CAST_NUMERIC_TYPES_EXPLICITLY.

which in itself is quite a helpful error.

Do I need to do anything differently or does something need implementing somewhere?

Thanks

in short:

(blabla).cast<int>();

Thanks ggael.