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#include "auto_f2c.h"
extern struct {
integer itwist, istart, iequib, nfixed, npsi, nunstab, nstab, nrev;
} blhom_1;
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* fhn : Homoclinic bifurcations in Fitz-Hugh Nagumo System */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
int func(integer ndim, const doublereal *u, const integer *icp,
const doublereal *par, integer ijac, doublereal *f, doublereal *dfdu,
doublereal *dfdp)
{
/* System generated locals */
integer dfdu_dim1 = ndim, dfdp_dim1 = ndim;
/* Function Body */
f[0] = u[1];
f[1] = par[0] * u[1] + u[0] * (u[0] - par[1]) * (u[0] - 1.) + u[2];
f[2] = par[2] * u[0] / par[0];
if (ijac == 0) {
return 0;
}
ARRAY2D(dfdu,0,0) = 0.;
ARRAY2D(dfdu,0,1) = 1.;
ARRAY2D(dfdu,0,2) = 0.;
ARRAY2D(dfdu,1,0) = u[0] * 3 * u[0] - (par[1] + 1) * 2 * u[0] + par[1];
ARRAY2D(dfdu,1,1) = par[0];
ARRAY2D(dfdu,1,2) = 1.;
ARRAY2D(dfdu,2,0) = par[2] / par[0];
ARRAY2D(dfdu,2,1) = 0.;
ARRAY2D(dfdu,2,2) = 0.;
if (ijac == 1) {
return 0;
}
ARRAY2D(dfdp,0,0) = 0.;
ARRAY2D(dfdp,0,1) = 0.;
ARRAY2D(dfdp,0,2) = 0.;
ARRAY2D(dfdp,1,0) = u[1];
ARRAY2D(dfdp,1,1) = -u[0] * (u[0] - 1.);
ARRAY2D(dfdp,1,2) = 0.;
ARRAY2D(dfdp,2,0) = -par[2] * u[0] / (par[0] * par[0]);
ARRAY2D(dfdp,2,1) = 0.;
ARRAY2D(dfdp,2,2) = u[0] / par[0];
return 0;
} /* func */
int stpnt(integer ndim, doublereal t, doublereal *u, doublereal *par)
{
/* ---------------- */
/* Sets parameter values for homoclinic bifurcation analysis (IPS=9). */
/* COMMON block needed if IPS=9 (homoclinic bifurcations) : */
/* ---------------------------------------------------------------------- */
/* Problem parameters (only PAR(1-9) are available to the user) : */
/* Function Body */
par[0] = .21;
/* c */
par[1] = .2;
/* a */
par[2] = .0025;
/* b = epsilon */
par[10] = .1;
/* ---------------------------------------------------------------------- */
/* If IEQUIB=1 then put the equilibrium in PAR(11+i), i=1,...,NDIM : */
/* truncated time interval */
if (blhom_1.iequib != 0) {
par[11] = 0.;
par[12] = 0.;
par[13] = 0.;
}
/* ---------------------------------------------------------------------- */
/* Distance along the unstable manifold : */
if (blhom_1.istart == 3) {
par[ndim * blhom_1.iequib + 11] = 1e-5;
}
/* ---------------------------------------------------------------------- */
return 0;
} /* stpnt */
/* Subroutine */ int pvls(integer ndim, const doublereal *u,
doublereal *par)
{
return 0;
} /* pvls */
/* Subroutine */ int bcnd(integer ndim, const doublereal *par, const integer *icp,
integer nbc, const doublereal *u0, const doublereal *u1, integer ijac,
doublereal *fb, doublereal *dbc)
{
return 0;
} /* bcnd */
/* Subroutine */ int icnd(integer ndim, const doublereal *par, const integer *icp,
integer nint, const doublereal *u, const doublereal *uold,
const doublereal *udot, const doublereal *upold, integer ijac,
doublereal *fi, doublereal *dint)
{
return 0;
} /* icnd */
/* Subroutine */ int fopt(integer ndim, const doublereal *u, const integer *icp,
const doublereal *par, integer ijac,
doublereal *fs, doublereal *dfdu, doublereal *dfdp)
{
return 0;
} /* fopt */
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