/* vector pp of parameters is as follows:
** pp[0]: principal eigenvalue
** pp[1]: fraction of 1st tensor
** pp[2]: phi for 1st tensor
** pp[3]: phi for 2nd tensor
*/
void
_tenLevmarPeledCB(double *pp, double *xx, int mm, int nn, void *_pvlData) {
/* char me[]="_tenLevmarPeledCB"; */
double tenA[7], tenB[7];
int ii;
tenDwiGagePvlData *pvlData;
double *egrad;
AIR_UNUSED(mm);
pvlData = AIR_CAST(tenDwiGagePvlData *, _pvlData);
/* Form the tensors using the estimated parms */
_tenPeledRotate2D(tenA, pp[0], pvlData->ten1Eval[2], pp[2]);
_tenPeledRotate2D(tenB, pp[0], pvlData->ten1Eval[2], pp[3]);
egrad = AIR_CAST(double *, pvlData->nten1EigenGrads->data);
/* skip past b0 gradient, HEY: not general purpose */
egrad += 3;
for (ii=0; ii<nn; ii++) {
double argA, argB, sigA, sigB;
argA = -pvlData->tec2->bValue*TEN_T3V_CONTR(tenA, egrad + 3*ii);
argB = -pvlData->tec2->bValue*TEN_T3V_CONTR(tenB, egrad + 3*ii);
if (pvlData->levmarUseFastExp) {
sigA = airFastExp(argA);
sigB = airFastExp(argB);
} else {
sigA = exp(argA);
sigB = exp(argB);
}
xx[ii] = pvlData->tec2->knownB0*(pp[1]*sigA + (1-pp[1])*sigB);
}
return;
}
int
main(int argc, char *argv[]) {
char *me;
unsigned int ii, NN;
double min, max, *out;
Nrrd *nout;
me = argv[0];
if (5 != argc) {
usage(me);
}
if (3 != (sscanf(argv[2], "%u", &NN)
+ sscanf(argv[1], "%lf", &min)
+ sscanf(argv[3], "%lf", &max))) {
fprintf(stderr, "%s: couldn't parse %s %s %s double uint double",
me, argv[1], argv[2], argv[3]);
usage(me);
}
nout = nrrdNew();
if (nrrdAlloc_va(nout, nrrdTypeDouble, 2,
AIR_CAST(size_t, 5),
AIR_CAST(size_t, NN))) {
fprintf(stderr, "%s: trouble allocating:\n%s", me,
biffGetDone(NRRD));
exit(1);
}
out = AIR_CAST(double *, nout->data);
for (ii=0; ii<NN; ii++) {
double xx, rr, ff, gg;
xx = AIR_AFFINE(0, ii, NN-1, min, max);
rr = exp(xx);
ff = airFastExp(xx);
gg = airExp(xx);
if (rr < 0 || ff < 0 || gg < 0
|| !AIR_EXISTS(rr) || !AIR_EXISTS(ff) || !AIR_EXISTS(gg)) {
fprintf(stderr, "%s: problem: %f -> real %f, approx %f %f\n",
me, xx, rr, ff, gg);
exit(1);
}
out[0] = rr;
out[1] = ff;
out[2] = (ff-rr)/rr;
out[3] = gg;
out[4] = (gg-rr)/rr;
out += 5;
}
if (nrrdSave(argv[4], nout, NULL)) {
fprintf(stderr, "%s: trouble saving:\n%s", me,
biffGetDone(NRRD));
exit(1);
}
exit(0);
}
/*
** 0 1 (2)
** texp N
*/
int
main(int argc, char *argv[]) {
char *me;
unsigned int ii, NN;
me = argv[0];
if (2 != argc || 1 != sscanf(argv[1], "%u", &NN)) {
fprintf(stderr, "%s: need one uint as argument\n", me);
exit(1);
}
for (ii=0; ii<NN; ii++) {
double xx;
xx = AIR_AFFINE(0.0, airDrandMT(), 1.0, -10, 10);
printf("%f %f\n", exp(xx), airFastExp(xx));
}
exit(0);
}
