/* nag_complex_polygamma (s14afc) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * NAG C Library
 *
 * Mark 6, 2000.
 */

#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 */
  Vscanf("%*[^\n] ");
  Vprintf("nag_complex_polygamma (s14afc) Example Program Results\n");
  Vprintf("       z            k         (d^k/dz^k)psi(z)\n");
  while(scanf(" (%lf,%lf)%ld%*[^\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)
        Vprintf("(%5.1f, %5.1f) %6ld (%12.4e, %12.4e)\n",
                z.re, z.im, k, y.re, y.im);
      else
        {
          Vprintf("Error from nag_complex_polygamma (s14afc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
    }
 END:
  return exit_status;
}