Przemyslaw Sliwa wrote: > Dear All, > > Is there a way using GSL to calculate the conjugate matrix or the conjugate transpose? > Yes. Store the matrix as a gsl_matrix_complex* M and use gsl_complex_conjugate( gsl_complex z ) iteratively on M to get the conjugate (using gsl_matrix_complex_get and gsl_matrix_complex_set functions). -- JDL