int ObsReadDepth::cal_simualpha() {
char id[]="Alpha";
simualpha.init(id, nGene);
for(int i=0; i<1000; i++) {
double a=cal_alpha(simugene[i], medianSample);
simualpha.set_data(i, a);
}
return 1;
}
float calVelUpdateStepLen(const FwiParams ¶ms,
const float *wlt,
const float *dobs,
const float *derr,
float epsil,
const EnquistAbc2d &fmMethod,
const ShotPosition &allSrcPos,
const ShotPosition &allGeoPos
)
{
int nt = params.nt;
int nz = params.nz;
int nx = params.nx;
int ng = params.ng;
int ns = params.ns;
std::vector<float> dcal(ng, 0); /* calculated/synthetic seismic data */
std::vector<float> sp0(nz * nx); /* source wavefield p0 */
std::vector<float> sp1(nz * nx); /* source wavefield p1 */
std::vector<float> sp2(nz * nx); /* source wavefield p2 */
std::vector<float> alpha1(ng, 0); /* numerator of alpha, length=ng */
std::vector<float> alpha2(ng, 0); /* denominator of alpha, length=ng */
for (int is = 0; is < ns; is++) {
std::fill(sp0.begin(), sp0.end(), 0);
std::fill(sp1.begin(), sp1.end(), 0);
ShotPosition currSrcPos = allSrcPos.clip(is);
for (int it = 0; it < nt; it++) {
fmMethod.addSource(&sp1[0], &wlt[it], currSrcPos);
fmMethod.stepForward(&sp0[0], &sp1[0], &sp2[0]);
cycleSwap(sp0, sp1, sp2);
fmMethod.recordSeis(&dcal[0], &sp0[0], allGeoPos);
sum_alpha12(&alpha1[0], &alpha2[0], &dcal[0], &dobs[is * nt * ng + it * ng], &derr[is * ng * nt + it * ng], ng);
}
}
float alpha = cal_alpha(&alpha1[0], &alpha2[0], epsil, ng);
return alpha;
}
