bool syl(Mat< typename T1::elem_type > &out, const Base< typename T1::elem_type, T1 > &in_A, const Base< typename T1::elem_type, T2 > &in_B, const Base< typename T1::elem_type, T3 > &in_C, const typename arma_blas_type_only< typename T1::elem_type >::result *junk=0)
find the solution of the Sylvester equation AX + XB = C