File: ext12c.c

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scilab 4.0-12
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/* Copyright Inria/Enpc */
#include "stack-c.h"

/****************************************
 *     same example with call to GetMatrixptr 
 *     param must be defined as a scilab variable 
 *     exemple with a call to matptr routine 
 *     -->param=[0.04,10000,3d+7];         
 *     -->link('ext12c.o','ext12c','C');     
 *     -->y=ode([1;0;0],0,[0.4,4],'ext12c') 
 *     *************************** 
 *     param entries are in stk(lp),stk(lp+1),stk(lp+2) 
 *     m,n = dimensions of param = 3,1 (or 1,3 if row v.) 
 *     (note that vector param not used in this example) 
 ****************************************/

int ext12c(neq, t, y, ydot)
     int *neq;
     double *t, *y, *ydot;
{
  static int m, n, lp;
  GetMatrixptr("param", &m, &n, &lp);
  ydot[0] = - (*stk(lp)) * y[0] + (*stk(lp+1)) * y[1] * y[2];
  ydot[2] = (*stk(lp + 2)) * y[1] * y[1];
  ydot[1] = -ydot[0] - ydot[2];
  return 0;
}