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

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nags.h>

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  Complex  y, z;
  Integer  exit_status = 0, k;
  NagError fail;

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpin = nag_example_file_io(argc, argv, "-data", NULL);
  fpout = nag_example_file_io(argc, argv, "-results", NULL);

  /* Skip heading in data file */
  fscanf(fpin, "%*[^\n] ");
  fprintf(fpout, "nag_complex_polygamma (s14afc) Example Program Results\n");
  fprintf(fpout, "       z            k         (d^k/dz^k)psi(z)\n");
  while (fscanf(fpin, " (%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)
        fprintf(fpout, "(%5.1f, %5.1f) %6ld (%13.4e, %13.4e)\n",
                z.re, z.im, k, y.re, y.im);
      else
        {
          fprintf(fpout, "Error from nag_complex_polygamma (s14afc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
    }
 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  return exit_status;
}