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beginning to fold in HOD code with jeremy tinker's approval

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P.M. Sutter 2013-12-30 22:48:07 -06:00
parent d8108d3a8e
commit 44cd0eb71f
95 changed files with 21950 additions and 0 deletions
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64
c_tools/hod/mnbrak.c Normal file
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#include <math.h>
#define NRANSI
#include "nrutil.h"
#define GOLD 1.618034
#define GLIMIT 100.0
#define TINY 1.0e-20
#define SHFT(a,b,c,d) (a)=(b);(b)=(c);(c)=(d);
void mnbrak(double *ax, double *bx, double *cx, double *fa, double *fb, double *fc,
double (*func)(double))
{
double ulim,u,r,q,fu,dum;
*fa=(*func)(*ax);
*fb=(*func)(*bx);
if (*fb > *fa) {
SHFT(dum,*ax,*bx,dum)
SHFT(dum,*fb,*fa,dum)
}
*cx=(*bx)+GOLD*(*bx-*ax);
*fc=(*func)(*cx);
while (*fb > *fc) {
r=(*bx-*ax)*(*fb-*fc);
q=(*bx-*cx)*(*fb-*fa);
u=(*bx)-((*bx-*cx)*q-(*bx-*ax)*r)/
(2.0*SIGN(FMAX(fabs(q-r),TINY),q-r));
ulim=(*bx)+GLIMIT*(*cx-*bx);
if ((*bx-u)*(u-*cx) > 0.0) {
fu=(*func)(u);
if (fu < *fc) {
*ax=(*bx);
*bx=u;
*fa=(*fb);
*fb=fu;
return;
} else if (fu > *fb) {
*cx=u;
*fc=fu;
return;
}
u=(*cx)+GOLD*(*cx-*bx);
fu=(*func)(u);
} else if ((*cx-u)*(u-ulim) > 0.0) {
fu=(*func)(u);
if (fu < *fc) {
SHFT(*bx,*cx,u,*cx+GOLD*(*cx-*bx))
SHFT(*fb,*fc,fu,(*func)(u))
}
} else if ((u-ulim)*(ulim-*cx) >= 0.0) {
u=ulim;
fu=(*func)(u);
} else {
u=(*cx)+GOLD*(*cx-*bx);
fu=(*func)(u);
}
SHFT(*ax,*bx,*cx,u)
SHFT(*fa,*fb,*fc,fu)
}
}
#undef GOLD
#undef GLIMIT
#undef TINY
#undef SHFT
#undef NRANSI