/* nag_complex_polygamma (s14afc) Example Program.
 *
 * Copyright 2017 Numerical Algorithms Group.
 *
 * NAG C Library
 *
 * Mark 26.2, 2017.
 */

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nags.h>

int main(void)
{
  Complex y, z;
  Integer exit_status = 0, k;
  NagError fail;

  INIT_FAIL(fail);

  /* Skip heading in data file */
  scanf("%*[^\n] ");
  printf("nag_complex_polygamma (s14afc) Example Program Results\n");
  printf("       z            k         (d^k/dz^k)psi(z)\n");
  while (scanf(" (%lf,%lf)%" NAG_IFMT "%*[^\n] ", &z.re, &z.im, &k) != EOF)
  {
    /* nag_complex_polygamma (s14afc).
     * Derivative of the psi function psi(z)
     */
    y = nag_complex_polygamma(z, k, &fail);
    if (fail.code == NE_NOERROR)
      printf("(%5.1f, %5.1f) %6" NAG_IFMT " (%13.4e, %13.4e)\n",
             z.re, z.im, k, y.re, y.im);
    else {
      printf("Error from nag_complex_polygamma (s14afc).\n%s\n",
             fail.message);
      exit_status = 1;
      goto END;
    }
  }
END:
  return exit_status;
}