//
//  Complex functions.
//
complex <double> *c8mat_expm1 ( int n, complex <double> a[] );
//
//  Real functions.
//
double *r8mat_expm1 ( int n, double a[] );
double *r8mat_expm2 ( int n, double a[] );
double *r8mat_expm3 ( int n, double a[] );