D8 : Other matrix equations (e.g., AX+XB=C)

f08qhc	nag_dtrsyl Solve real Sylvester matrix equation AX+XB=C, A and B are upper quasi-triangular or transposes
f08qvc	nag_ztrsyl Solve complex Sylvester matrix equation AX+XB=C, A and B are upper triangular or conjugate-transposes