/* nag_wfilt (c09aac) Example Program.
 *
 * Copyright 2008, Numerical Algorithms Group.
 *
 * Mark 9, 2009.
 */
/* Pre-processor includes */
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagc09.h>

int main(int argc, char *argv[])
{
  FILE            *fpin, *fpout;
  /* Constants */
  Integer         licomm = 100;
  /*Integer scalar and array declarations */
  Integer         exit_status = 0;
  Integer         i, n, nf, nnz, nwc, nwl, ny;
  Integer         *dwtlev = 0, *icomm = 0;
  NagError        fail;
  Nag_Wavelet     wavnamenum;
  Nag_WaveletMode modenum;
  /*Double scalar and array declarations */
  double          *c = 0, *x = 0, *y = 0;
  /*Character scalar and array declarations */
  char            mode[24], wavnam[20];

  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_wfilt (c09aac) Example Program Results\n\n");
  /*     Skip heading in data file*/
  fscanf(fpin, "%*[^\n] ");
  /*     Read n - length of input data sequence*/
  fscanf(fpin, "%ld%*[^\n] ", &n);
  if (!(x = NAG_ALLOC(n, double)) ||
      !(y = NAG_ALLOC(n, double)) ||
      !(icomm = NAG_ALLOC(licomm, Integer)))
    {
      fprintf(fpout, "Allocation failure\n");
      exit_status = -1;
      goto END;
    }
  /*     Read Wavelet name (wavnam) and end mode (mode)*/
  fscanf(fpin, "%s%s%*[^\n] ", wavnam, mode);
  /*
   * nag_enum_name_to_value (x04nac).
   * Converts NAG enum member name to value
   */
  wavnamenum = (Nag_Wavelet) nag_enum_name_to_value(wavnam);
  modenum = (Nag_WaveletMode) nag_enum_name_to_value(mode);
  if (n >= 2)
    {
      fprintf(fpout, "   Parameters read from file :: \n");
      fprintf(fpout, "     Wavelet  :%15s\n", wavnam);
      fprintf(fpout, "     End mode :%15s\n", mode);
      fprintf(fpout, "     N        :%15ld\n\n", n);
      /*        Read data array and write it out*/
      fprintf(fpout, "%s\n", "   Input Data           X :");
      for (i = 0; i < n; i++)
        {
          fscanf(fpin, "%lf ", &x[i]);
          fprintf(fpout, "%8.3f%s", x[i], (i+1)%8?" ":"\n");
        }
      fscanf(fpin, "%*[^\n] ");
      fprintf(fpout, "\n");
      /*
       * nag_wfilt (c09aac)
       * Wavelet filter query
       */
      nag_wfilt(wavnamenum, Nag_Multilevel, modenum, n, &nwl, &nf, &nwc,
                icomm, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout, "Error from nag_wfilt (c09aac).\n%s\n", fail.message);
          exit_status = 1;
          goto END;
        }
      if (!(c = NAG_ALLOC(nwc, double)) ||
          !(dwtlev = NAG_ALLOC(nwl+1, Integer)))
        {
          fprintf(fpout, "Allocation failure\n");
          exit_status = -1;
          goto END;
        }
      /*        Perform Discrete Wavelet transform*/
      /*
       * nag_mldwt (c09ccc)
       * one-dimensional multi-level discrete wavelet transform (mldwt)
       */
      nag_mldwt(n, x, nwc, c, nwl, dwtlev, icomm, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout, "Error from nag_mldwt (c09ccc).\n%s\n", fail.message);
          exit_status = 1;
          goto END;
        }
      fprintf(fpout, "   Length of wavelet filter :            %10ld\n", nf);
      fprintf(fpout, "   Number of Levels :                    %10ld\n", nwl);
      fprintf(fpout, "   Number of coefficients in each level : \n");
      for (i = 0; i < nwl+1; i++)
        fprintf(fpout, "    %8ld%s", dwtlev[i], (i+1)%8?" ":"\n");
      fprintf(fpout, "\n");
      fprintf(fpout, "   Total number of wavelet coefficients :%10ld\n", nwc);
      nnz = 0;
      for (i = 0; i < nwl+1; i++)
        nnz = nnz+dwtlev[i];
      fprintf(fpout, "\n");
      fprintf(fpout, "   Wavelet coefficients C : \n");
      for (i = 0; i < nnz; i++)
        fprintf(fpout, "%8.3f%s", c[i], (i+1)%8?" ":"\n");
      fprintf(fpout, "\n");
      /*           Reconstruct original data*/
      ny = n;
      /*
       * nag_imldwt (c09cdc)
       * one-dimensional inverse multi-level discrete wavelet transform
       * (imldwt)
       */
      nag_imldwt(nwl, nwc, c, n, y, icomm, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout, "Error from nag_imldwt (c09cdc).\n%s\n", fail.message);
          exit_status = 1;
          goto END;
        }
      fprintf(fpout, "\n");
      fprintf(fpout, "   Reconstruction       Y : \n");
      for (i = 0; i < ny; i++)
        fprintf(fpout, "%8.3f%s", y[i], (i+1)%8?" ":"\n");
    }

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

  return exit_status;
}