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/* Copyright (C) 2017 - IIT Bombay - FOSSEE
This file must be used under the terms of the CeCILL.
This source file is licensed as described in the file COPYING, which
you should have received as part of this distribution. The terms
are also available at
http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
Author: Ankit Raj
Organization: FOSSEE, IIT Bombay
Email: toolbox@scilab.in
*/
#include<stdio.h>
#include<math.h>
#include "sincd.h"
#include "fsfirlin.h"
//#define PI 3.14159265358979
void dfsfirlina(double* hd,int size,double flag,double* hst)
{
int n1=size,n;
if( n1%2==0)
{
n=2*n1;
}
else
{
n=2*n1+1;
}
double scd[8*n+1];
//STRAT SINCD
double npt=4*n;
int sz=4*n;
double PI=M_PI;
double pas=PI/npt;
double om[sz+1];
int i;
for(i=0;i<=sz;i++)
{
om[i]=i*pas;
}
double eps=pow(-1,(n-1));
double s1[sz+1],s2[sz+1];
double s[2*(sz)+1];
double sr[2*(sz)+1];
if(flag==1)
{
int j,k;
for(j=0;j<=4*n;j++)
{
s1[j]=sin(n*om[j]);
s2[j]=sin(om[j]);
}
s1[0]=n;
s2[0]=1;
s1[sz]=n*eps;
s2[sz]=1;
for(k=0;k<=4*n;k++)
{
s[k]=s1[k]/s2[k];
}
int x;
for(x=0;x<=4*n;x++)
{
scd[sz-x]=s[x];
}
int l;
for(l=4*n+1;l<=8*n;l++)
{
scd[l]=s[l-(sz)];
}
int m;
for(m=0;m<=8*n;m++)
{
scd[m]=scd[m]/n;
}
}
else
{
int a;
for(a=0;a<=4*n;a++)
{
om[a]=om[a]-(PI/(2*n));
}
int j,k;
for(j=0;j<=4*n;j++)
{
s1[j]=sin(n*om[j]);
s2[j]=sin(om[j]);
}
s1[2]=n;
s2[2]=1;
for(k=0;k<=4*n;k++)
{
s[k]=s1[k]/s2[k];
}
int m;
for(m=0;m<=4*n;m++)
{
scd[m]=(eps*s[m])/n;
}
int l;
for(l=4*n+1;l<=8*n;l++)
{
scd[l]=s[l-(sz)]/n;
}
}
//END SINCD
int ii;
for(ii=4*n;ii<=6*n;ii++)
{
hst[ii-(4*n)]=hd[0]*scd[ii];
}
int epsi;
epsi=pow(-1,n-1);
int jj;
for(jj=1;jj<=(n1-1);jj++)
{
double tp1[2*n+1];
double tp2[2*n+1];
int k,l;
for(k=(-4*jj+4*n);k<=(-4*jj+6*n);k++)
{
tp1[k-(-4*jj+4*n)]=hd[jj]*scd[k];
}
for(l=(4*jj);l<=(4*jj+2*n);l++)
{
tp2[l-(4*jj)]=hd[jj]*(epsi*scd[l]);
}
int m;
for(m=0;m<=2*n;m++)
{
hst[m]=hst[m]+(tp1[m]+tp2[m]);
}
}
}
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