tanhblk
/* Modnumlib Scicos interfacing function
* Copyright (C) 2009 Alan Layec
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* tanhblk Scicos hyperbolic tangent block
* Type 2 simulation function ver 1.0 - scilab-2.6&2.7
* 13 octobre 2003 - IRCOM GROUP - Author : A.Layec
*/
/* REVISION HISTORY :
* $Log$
*/
#include<math.h>
#include "machine.h"
/* Ce bloc réalise l'opération y[0]=rpar[0]*tanh(rpar[1]*u[0])
* entrées régulières : vecteur des entrées u[0..nu-1]
* sorties régulières : vecteurs des sorties y[0..nu-1]
* entrées et sorties d'évenement : néant
* paramètres rélls rpar[0..nu-1] : vecteur du gain
* rpar[nu..2*nu-1] : vecteur du coefficient
*/
/*prototype*/
void tanhblk(flag,nevprt,t,xd,x,nx,z,nz,tvec,ntvec,rpar,nrpar,
ipar,nipar,inptr,insz,nin,outptr,outsz,nout)
integer *flag,*nevprt,*nx,*nz,*ntvec,*nrpar,ipar[],*nipar,insz[],*nin,outsz[],*nout;
double x[],xd[],z[],tvec[],rpar[];
double *inptr[],*outptr[],*t;
{
/*déclaration des variables*/
double *y;
double *u;
double t1,t2;
int i,nu;
/*récupération des adresses des ports réguliers*/
y = (double *)outptr[0];
u = (double *)inptr[0];
/*récupération de la taille du port d'entrée*/
nu=insz[0];
for(i=0;i<nu;i++)
{
t1=exp(rpar[nu+i]*u[i]);
t2=exp(-rpar[nu+i]*u[i]);
y[i]=rpar[i]*((t1-t2)/(t1+t2));
}
}