box.c

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/* 
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 */


#include "extern.h"

/*  Changes:
 *
 *  Added nbox function: twf; March 01, 2016
 *  Added hanning function: twf; Jan 04, 2017
 *
 */

int doBoxcar()
{
  float tfloat[MAX_CHANS];
  struct LP_IMAGE_INFO *image = h0;

  /* If nbox != 0 then smooth the data */
  if(env->nbox > 0)
  {
    st_report("Performing boxcar(%d) on array %s", env->nbox, image->name);

    bcopy((char *)&image->yplot1[0], (char *)&tfloat[0], image->head.noint * sizeof(float));

    boxcar(&tfloat[0], &image->yplot1[0], image->head.noint, env->nbox);
  }
  else
  {
    st_fail("nbox <= 0");
    return(1);
  }

  return(0);
}


void boxcar(input, output, len, order)
float *input, *output;
int len, order;
{
  int i, j, left, right;
  float box;

  for(i=0;i<len;i++)
  {
    box = 0.0;
    left = ((i-order) < 0 ? 0 : i-order);
    right = ((i+order) >= len ? len : i+order);

    for (j=left; j<right; j++)
    {
      box += input[j];
    }
    output[i] = box / (float)(right-left);
  }

  return;
}


int doHanning()
{
  float tfloat[MAX_CHANS];
  struct LP_IMAGE_INFO *image = h0;

  st_report("Performing hanning on array %s", image->name);

  bcopy((char *)&image->yplot1[0], (char *)&tfloat[0], image->head.noint * sizeof(float));

  hanning(&tfloat[0], &image->yplot1[0], image->head.noint);

  st_report("Dropping 2 channels off both ends");

  env->bdrop += 2;
  env->edrop += 2;

  return(0);
}


int hanning(input, output, n)
float *input, *output;
int n;
{
  int    i, j, ib, ie, ic, nw;
  double sum, twt;
  float  wgt[4];

  wgt[0] = 0.25;
  wgt[1] = 0.50;
  wgt[2] = 0.25;
  nw     = 3;

  ib = 0;
  ie = n - (nw-1);
  ic = nw / 2;

  st_report("Performing Hanning from %d to %d", ib, ie);

  for(i=ib;i<ie;i++)
  {
    sum = 0.0;
    twt = 0.0;

    for(j=0;j<nw;j++)
    {
      sum += wgt[j] * input[i+j-1];
      twt += wgt[j];
    }

    if(twt > 0.0)
    {
      output[i+ic] = sum / twt;
    }
    else
    {
      output[i+ic] = GSL_POSINF;
    }
  }

  return(0);
}