/* nag_zwaxpby (f16ghc) Example Program.
 *
 * Copyright 2005 Numerical Algorithms Group.
 *
 * Mark 9, 2009.
 */

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagf16.h>
#include <nagx04.h>

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  /* Scalars */
  Integer  exit_status, i, incw, incx, incy, n, wlen, xlen, ylen;
  Complex  alpha, beta;
  /* Arrays */
  Complex  *w = 0, *x = 0, *y = 0;
  /* Nag Types */
  NagError fail;

  exit_status = 0;
  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);

  fprintf(fpout, "nag_zwaxpby (f16ghc) Example Program Results\n\n");

  /* Skip heading in data file */
  fscanf(fpin, "%*[^\n] ");
  /* Read number of elements */
  fscanf(fpin, "%ld%*[^\n] ", &n);
  /* Read increments */
  fscanf(fpin, "%ld%ld%ld%*[^\n] ", &incx, &incy, &incw);
  /* Read factors alpha and beta */
  fscanf(fpin, " ( %lf , %lf ) ", &alpha.re, &alpha.im);
  fscanf(fpin, " ( %lf , %lf ) %*[^\n] ", &beta.re, &beta.im);

  wlen = MAX(1, 1 + (n - 1)*ABS(incw));
  xlen = MAX(1, 1 + (n - 1)*ABS(incx));
  ylen = MAX(1, 1 + (n - 1)*ABS(incy));

  if (n > 0)
    {
      /* Allocate memory */
      if (!(w = NAG_ALLOC(wlen, Complex)) ||
          !(x = NAG_ALLOC(xlen, Complex)) ||
          !(y = NAG_ALLOC(ylen, Complex)))
        {
          fprintf(fpout, "Allocation failure\n");
          exit_status = -1;
          goto END;
        }
    }
  else
    {
      fprintf(fpout, "Invalid n\n");
      exit_status = 1;
      goto END;
    }
  /* Input vector x */
  for (i = 0; i < xlen; i = i + incx)
    fscanf(fpin, " ( %lf , %lf ) ", &x[i].re, &x[i].im);
  fscanf(fpin, "%*[^\n] ");
  /* Input vector y */
  for (i = 0; i < ylen; i = i + incy)
    fscanf(fpin, " ( %lf , %lf ) ", &y[i].re, &y[i].im);
  fscanf(fpin, "%*[^\n] ");

  /* nag_zwaxpby (f16ghc).
   * Performs w := alpha*x + beta*y  */
  nag_zwaxpby(n, alpha, x, incx, beta, y, incy, w, incw, &fail);

  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_zwaxpby (f16ghc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Print the result */
  fprintf(fpout, "Result of the scaled vector addition is\n");
  fprintf(fpout, "w = ( ");
  for (i = 0; i < wlen - 1; i = i + incw)
    fprintf(fpout, "(%9.4f,%9.4f), ", w[i].re, w[i].im);
  fprintf(fpout, "(%9.4f,%9.4f) )\n", w[wlen - 1].re, w[wlen - 1].im);

 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (w) NAG_FREE(w);
  if (x) NAG_FREE(x);
  if (y) NAG_FREE(y);

  return exit_status;
}