void TDisplay3D::PaintBkgr()
{
rectfill(bmpCanvasBackground,0,0,
bmpCanvasBackground->w,
bmpCanvasBackground->h,
makecol24(0,0,0));
PutGrid(bmpCanvasBackground);
blit(bmpCanvasBackground, bmpCanvas, 0, 0, 0, 0, bmpCanvas->w, bmpCanvas->h);
}
static int Integrate(This *t, real *integral, real *error, real *prob)
{
bin_t *bins;
count dim, comp;
int fail;
struct {
count niter;
number nsamples, neval;
Cumulants cumul[NCOMP];
Grid grid[NDIM];
} state;
int statemsg = VERBOSE;
struct stat st;
if( VERBOSE > 1 ) {
char s[512];
sprintf(s, "Vegas input parameters:\n"
" ndim " COUNT "\n ncomp " COUNT "\n"
" epsrel " REAL "\n epsabs " REAL "\n"
" flags %d\n seed %d\n"
" mineval " NUMBER "\n maxeval " NUMBER "\n"
" nstart " NUMBER "\n nincrease " NUMBER "\n"
" nbatch " NUMBER "\n gridno %d\n"
" statefile \"%s\"",
t->ndim, t->ncomp,
t->epsrel, t->epsabs,
t->flags, t->seed,
t->mineval, t->maxeval,
t->nstart, t->nincrease, t->nbatch,
t->gridno, t->statefile);
Print(s);
}
if( BadComponent(t) ) return -2;
if( BadDimension(t) ) return -1;
FrameAlloc(t, ShmRm(t));
ForkCores(t);
Alloc(bins, t->nbatch*t->ndim);
if( (fail = setjmp(t->abort)) ) goto abort;
IniRandom(t);
if( t->statefile && *t->statefile == 0 ) t->statefile = NULL;
if( t->statefile &&
stat(t->statefile, &st) == 0 &&
st.st_size == sizeof state && (st.st_mode & 0400) ) {
cint h = open(t->statefile, O_RDONLY);
read(h, &state, sizeof state);
close(h);
t->rng.skiprandom(t, t->neval = state.neval);
if( VERBOSE ) {
char s[256];
sprintf(s, "\nRestoring state from %s.", t->statefile);
Print(s);
}
}
else {
state.niter = 0;
state.nsamples = t->nstart;
Zap(state.cumul);
GetGrid(t, state.grid);
}
/* main iteration loop */
for( ; ; ) {
number nsamples = state.nsamples;
creal jacobian = 1./nsamples;
Grid margsum[NCOMP][NDIM];
Zap(margsum);
for( ; nsamples > 0; nsamples -= t->nbatch ) {
cnumber n = IMin(t->nbatch, nsamples);
real *w = t->frame;
real *x = w + n;
real *f = x + n*t->ndim;
real *lastf = f + n*t->ncomp;
bin_t *bin = bins;
while( x < f ) {
real weight = jacobian;
t->rng.getrandom(t, x);
for( dim = 0; dim < t->ndim; ++dim ) {
creal pos = *x*NBINS;
ccount ipos = (count)pos;
creal prev = (ipos == 0) ? 0 : state.grid[dim][ipos - 1];
creal diff = state.grid[dim][ipos] - prev;
*x++ = prev + (pos - ipos)*diff;
*bin++ = ipos;
weight *= diff*NBINS;
}
*w++ = weight;
}
DoSample(t, n, w, f, t->frame, state.niter + 1);
bin = bins;
w = t->frame;
while( f < lastf ) {
creal weight = *w++;
for( comp = 0; comp < t->ncomp; ++comp ) {
real wfun = weight*(*f++);
if( wfun ) {
Cumulants *c = &state.cumul[comp];
Grid *m = margsum[comp];
c->sum += wfun;
c->sqsum += wfun *= wfun;
for( dim = 0; dim < t->ndim; ++dim )
m[dim][bin[dim]] += wfun;
}
}
bin += t->ndim;
}
}
fail = 0;
/* compute the integral and error values */
for( comp = 0; comp < t->ncomp; ++comp ) {
Cumulants *c = &state.cumul[comp];
real avg, sigsq;
real w = Weight(c->sum, c->sqsum, state.nsamples);
sigsq = 1/(c->weightsum += w);
avg = sigsq*(c->avgsum += w*c->sum);
c->avg = LAST ? (sigsq = 1/w, c->sum) : avg;
c->err = sqrt(sigsq);
fail |= (c->err > MaxErr(c->avg));
if( state.niter == 0 ) c->guess = c->sum;
else {
c->chisum += w *= c->sum - c->guess;
c->chisqsum += w*c->sum;
}
c->chisq = c->chisqsum - avg*c->chisum;
c->sum = c->sqsum = 0;
}
if( VERBOSE ) {
char s[128 + 128*NCOMP], *p = s;
p += sprintf(p, "\n"
"Iteration " COUNT ": " NUMBER " integrand evaluations so far",
state.niter + 1, t->neval);
for( comp = 0; comp < t->ncomp; ++comp ) {
cCumulants *c = &state.cumul[comp];
p += sprintf(p, "\n[" COUNT "] "
REAL " +- " REAL " \tchisq " REAL " (" COUNT " df)",
comp + 1, c->avg, c->err, c->chisq, state.niter);
}
Print(s);
}
if( fail == 0 && t->neval >= t->mineval ) {
if( t->statefile && KEEPFILE == 0 ) unlink(t->statefile);
break;
}
if( t->neval >= t->maxeval && t->statefile == NULL ) break;
if( t->ncomp == 1 )
for( dim = 0; dim < t->ndim; ++dim )
RefineGrid(t, state.grid[dim], margsum[0][dim]);
else {
for( dim = 0; dim < t->ndim; ++dim ) {
Grid wmargsum;
Zap(wmargsum);
for( comp = 0; comp < t->ncomp; ++comp ) {
real w = state.cumul[comp].avg;
if( w != 0 ) {
creal *m = margsum[comp][dim];
count bin;
w = 1/Sq(w);
for( bin = 0; bin < NBINS; ++bin )
wmargsum[bin] += w*m[bin];
}
}
RefineGrid(t, state.grid[dim], wmargsum);
}
}
++state.niter;
state.nsamples += t->nincrease;
if( t->statefile ) {
cint h = creat(t->statefile, 0666);
if( h != -1 ) {
state.neval = t->neval;
write(h, &state, sizeof state);
close(h);
if( statemsg ) {
char s[256];
sprintf(s, "\nSaving state to %s.", t->statefile);
Print(s);
statemsg = false;
}
}
if( t->neval >= t->maxeval ) break;
}
}
for( comp = 0; comp < t->ncomp; ++comp ) {
cCumulants *c = &state.cumul[comp];
integral[comp] = c->avg;
error[comp] = c->err;
prob[comp] = ChiSquare(c->chisq, state.niter);
}
abort:
PutGrid(t, state.grid);
free(bins);
WaitCores(t);
FrameFree(t);
return fail;
}
