void BSplineInterpolation::fitFromData(const Samples &samples) { /* preprocess samples and extract some info */ Samples ssamples = samples; std::sort(ssamples.begin(), ssamples.end()); const int numSamples = ssamples.size(); const float minSampleX = ssamples[0].first; const float maxSampleX = ssamples.back().first; /* prepare fitting data */ gsl_vector *x = gsl_vector_alloc(ssamples.size()); gsl_vector *y = gsl_vector_alloc(ssamples.size()); for (int i=0; i<ssamples.size(); i++) { gsl_vector_set(x, i, ssamples[i].first); gsl_vector_set(y, i, ssamples[i].second); } /* uniform knots distributed in sample range */ gsl_bspline_knots_uniform(minSampleX, maxSampleX, bSplineWorkspace); /* construct a fit matrix */ gsl_matrix *fitMatrix = gsl_matrix_alloc(numSamples, nCoeffs); for (int i=0; i<numSamples; i++) { /* compute B_j(xi) for all j */ double xi = gsl_vector_get(x, i); gsl_bspline_eval(xi, bSpline, bSplineWorkspace); /* fill in row i */ for (int j=0; j<nCoeffs; j++) { double Bj = gsl_vector_get(bSpline, j); gsl_matrix_set(fitMatrix, i, j, Bj); } } /* fit spline to data */ gsl_multifit_linear_workspace *mws = gsl_multifit_linear_alloc(numSamples, nCoeffs); double chisq; size_t rank; double tol = 0.1; gsl_multifit_linear(fitMatrix, y, cParameters, covMatrix, &chisq, mws); //gsl_multifit_linear_svd(fitMatrix, y, tol, // &rank, cParameters, covMatrix, &chisq, mws); splineMinX = minSampleX; splineMaxX = maxSampleX; /* clean up */ gsl_vector_free(x); gsl_vector_free(y); gsl_matrix_free(fitMatrix); gsl_multifit_linear_free(mws); }
/*============================================================================= * MINIMIZING FUNCTION *=============================================================================*/ double min_func(double x, void *params){ double y, yerr; gsl_vector *B; B = gsl_vector_alloc(ncoeffs); gsl_bspline_eval(x, B, bw); gsl_multifit_linear_est(B, c, cov, &y, &yerr); return y; }
int gsl_bspline(double *x, int *n, int *degree, int *nbreak, double *x_min, double *x_max, double *quantile_vector, int *knots_int, double *Bx) { int k = *degree + 1; /* k in gsl */ int ncoeffs; int i, j; gsl_bspline_workspace *bw = gsl_bspline_alloc(k, *nbreak); ncoeffs = (int)gsl_bspline_ncoeffs(bw); /* *nbreak+k-2 */ gsl_vector *B = gsl_vector_alloc(ncoeffs); gsl_vector *quantile_vec = gsl_vector_alloc(*nbreak); /* 7/12/10 added support for quantile knots */ if(*knots_int == 0) { gsl_bspline_knots_uniform(*x_min, *x_max, bw); } else { for(i = 0; i < *nbreak; i++) gsl_vector_set(quantile_vec, i, quantile_vector[i]); gsl_bspline_knots(quantile_vec, bw); } for (i = 0; i < *n; ++i) { /* compute B_j(xi) for all j */ gsl_bspline_eval(x[i], B, bw); /* fill in row i of Bx */ for (j = 0; j < ncoeffs; ++j) { double Bj = gsl_vector_get(B, j); Bx[i*ncoeffs+j] = Bj; /* Bx:*n-by-(*nbreak+*degree-1) */ } } gsl_bspline_free(bw); gsl_vector_free(B); gsl_vector_free(quantile_vec); return(0); } /* main() */
DoubleReal TransformationModelBSpline::evaluate(const DoubleReal value) const { DoubleReal result; if (value < xmin_) // extrapolate on left side { result = offset_min_ - slope_min_ * (xmin_ - value); } else if (value > xmax_) // extrapolate on right side { result = offset_max_ + slope_max_ * (value - xmax_); } else // evaluate B-splines { double yerr; gsl_bspline_eval(value, bsplines_, workspace_); gsl_multifit_linear_est(bsplines_, coeffs_, cov_, &result, &yerr); } return result; }
void test_bspline (gsl_bspline_workspace * bw) { gsl_vector *B; size_t i, j; size_t n = 100; size_t ncoeffs = gsl_bspline_ncoeffs (bw); size_t order = gsl_bspline_order (bw); size_t nbreak = gsl_bspline_nbreak (bw); double a = gsl_bspline_breakpoint (0, bw); double b = gsl_bspline_breakpoint (nbreak - 1, bw); B = gsl_vector_alloc (ncoeffs); for (i = 0; i < n; i++) { double xi = a + (b - a) * (i / (n - 1.0)); double sum = 0; gsl_bspline_eval (xi, B, bw); for (j = 0; j < ncoeffs; j++) { double Bj = gsl_vector_get (B, j); int s = (Bj < 0 || Bj > 1); gsl_test (s, "basis-spline coefficient %u is in range [0,1] for x=%g", j, xi); sum += Bj; } gsl_test_rel (sum, 1.0, order * GSL_DBL_EPSILON, "basis-spline order %u is normalized for x=%g", order, xi); } gsl_vector_free (B); }
int main (void) { const size_t n = N; const size_t ncoeffs = NCOEFFS; const size_t nbreak = NBREAK; size_t i, j; gsl_bspline_workspace *bw; gsl_vector *B; double dy; gsl_rng *r; gsl_vector *c, *w; gsl_vector *x, *y; gsl_matrix *X, *cov; gsl_multifit_linear_workspace *mw; double chisq; double Rsq; double dof; gsl_rng_env_setup(); r = gsl_rng_alloc(gsl_rng_default); /* allocate a cubic bspline workspace (k = 4) */ bw = gsl_bspline_alloc(4, nbreak); B = gsl_vector_alloc(ncoeffs); x = gsl_vector_alloc(n); y = gsl_vector_alloc(n); X = gsl_matrix_alloc(n, ncoeffs); c = gsl_vector_alloc(ncoeffs); w = gsl_vector_alloc(n); cov = gsl_matrix_alloc(ncoeffs, ncoeffs); mw = gsl_multifit_linear_alloc(n, ncoeffs); printf("#m=0,S=0\n"); /* this is the data to be fitted */ for (i = 0; i < n; ++i) { double sigma; double xi = (15.0 / (N - 1)) * i; double yi = cos(xi) * exp(-0.1 * xi); sigma = 0.1 * yi; dy = gsl_ran_gaussian(r, sigma); yi += dy; gsl_vector_set(x, i, xi); gsl_vector_set(y, i, yi); gsl_vector_set(w, i, 1.0 / (sigma * sigma)); printf("%f %f\n", xi, yi); } /* use uniform breakpoints on [0, 15] */ gsl_bspline_knots_uniform(0.0, 15.0, bw); /* construct the fit matrix X */ for (i = 0; i < n; ++i) { double xi = gsl_vector_get(x, i); /* compute B_j(xi) for all j */ gsl_bspline_eval(xi, B, bw); /* fill in row i of X */ for (j = 0; j < ncoeffs; ++j) { double Bj = gsl_vector_get(B, j); gsl_matrix_set(X, i, j, Bj); } } /* do the fit */ gsl_multifit_wlinear(X, w, y, c, cov, &chisq, mw); dof = n - ncoeffs; Rsq = 1.0 - chisq / gsl_stats_wtss(w->data, 1, y->data, 1, y->size); fprintf(stderr, "chisq/dof = %e, Rsq = %f\n", chisq / dof, Rsq); /* output the smoothed curve */ { double xi, yi, yerr; printf("#m=1,S=0\n"); for (xi = 0.0; xi < 15.0; xi += 0.1) { gsl_bspline_eval(xi, B, bw); gsl_multifit_linear_est(B, c, cov, &yi, &yerr); printf("%f %f\n", xi, yi); } } gsl_rng_free(r); gsl_bspline_free(bw); gsl_vector_free(B); gsl_vector_free(x); gsl_vector_free(y); gsl_matrix_free(X); gsl_vector_free(c); gsl_vector_free(w); gsl_matrix_free(cov); gsl_multifit_linear_free(mw); return 0; } /* main() */
/** Executes the algorithm * */ void SplineBackground::exec() { API::MatrixWorkspace_sptr inWS = getProperty("InputWorkspace"); int spec = getProperty("WorkspaceIndex"); if (spec > static_cast<int>(inWS->getNumberHistograms())) throw std::out_of_range("WorkspaceIndex is out of range."); const MantidVec& X = inWS->readX(spec); const MantidVec& Y = inWS->readY(spec); const MantidVec& E = inWS->readE(spec); const bool isHistogram = inWS->isHistogramData(); const int ncoeffs = getProperty("NCoeff"); const int k = 4; // order of the spline + 1 (cubic) const int nbreak = ncoeffs - (k - 2); if (nbreak <= 0) throw std::out_of_range("Too low NCoeff"); gsl_bspline_workspace *bw; gsl_vector *B; gsl_vector *c, *w, *x, *y; gsl_matrix *Z, *cov; gsl_multifit_linear_workspace *mw; double chisq; int n = static_cast<int>(Y.size()); bool isMasked = inWS->hasMaskedBins(spec); std::vector<int> masked(Y.size()); if (isMasked) { for(API::MatrixWorkspace::MaskList::const_iterator it=inWS->maskedBins(spec).begin();it!=inWS->maskedBins(spec).end();++it) masked[it->first] = 1; n -= static_cast<int>(inWS->maskedBins(spec).size()); } if (n < ncoeffs) { g_log.error("Too many basis functions (NCoeff)"); throw std::out_of_range("Too many basis functions (NCoeff)"); } /* allocate a cubic bspline workspace (k = 4) */ bw = gsl_bspline_alloc(k, nbreak); B = gsl_vector_alloc(ncoeffs); x = gsl_vector_alloc(n); y = gsl_vector_alloc(n); Z = gsl_matrix_alloc(n, ncoeffs); c = gsl_vector_alloc(ncoeffs); w = gsl_vector_alloc(n); cov = gsl_matrix_alloc(ncoeffs, ncoeffs); mw = gsl_multifit_linear_alloc(n, ncoeffs); /* this is the data to be fitted */ int j = 0; for (MantidVec::size_type i = 0; i < Y.size(); ++i) { if (isMasked && masked[i]) continue; gsl_vector_set(x, j, (isHistogram ? (0.5*(X[i]+X[i+1])) : X[i])); // Middle of the bins, if a histogram gsl_vector_set(y, j, Y[i]); gsl_vector_set(w, j, E[i]>0.?1./(E[i]*E[i]):0.); ++j; } if (n != j) { gsl_bspline_free(bw); gsl_vector_free(B); gsl_vector_free(x); gsl_vector_free(y); gsl_matrix_free(Z); gsl_vector_free(c); gsl_vector_free(w); gsl_matrix_free(cov); gsl_multifit_linear_free(mw); throw std::runtime_error("Assertion failed: n != j"); } double xStart = X.front(); double xEnd = X.back(); /* use uniform breakpoints */ gsl_bspline_knots_uniform(xStart, xEnd, bw); /* construct the fit matrix X */ for (int i = 0; i < n; ++i) { double xi=gsl_vector_get(x, i); /* compute B_j(xi) for all j */ gsl_bspline_eval(xi, B, bw); /* fill in row i of X */ for (j = 0; j < ncoeffs; ++j) { double Bj = gsl_vector_get(B, j); gsl_matrix_set(Z, i, j, Bj); } } /* do the fit */ gsl_multifit_wlinear(Z, w, y, c, cov, &chisq, mw); /* output the smoothed curve */ API::MatrixWorkspace_sptr outWS = WorkspaceFactory::Instance().create(inWS,1,X.size(),Y.size()); { outWS->getAxis(1)->setValue(0, inWS->getAxis(1)->spectraNo(spec)); double xi, yi, yerr; for (MantidVec::size_type i=0;i<Y.size();i++) { xi = X[i]; gsl_bspline_eval(xi, B, bw); gsl_multifit_linear_est(B, c, cov, &yi, &yerr); outWS->dataY(0)[i] = yi; outWS->dataE(0)[i] = yerr; } outWS->dataX(0) = X; } gsl_bspline_free(bw); gsl_vector_free(B); gsl_vector_free(x); gsl_vector_free(y); gsl_matrix_free(Z); gsl_vector_free(c); gsl_vector_free(w); gsl_matrix_free(cov); gsl_multifit_linear_free(mw); setProperty("OutputWorkspace",outWS); }
// [[Rcpp::export]] Rcpp::List fitData(Rcpp::DataFrame ds) { const size_t ncoeffs = NCOEFFS; const size_t nbreak = NBREAK; const size_t n = N; size_t i, j; Rcpp::DataFrame D(ds); // construct the data.frame object RcppGSL::vector<double> y = D["y"]; // access columns by name, RcppGSL::vector<double> x = D["x"]; // assigning to GSL vectors RcppGSL::vector<double> w = D["w"]; gsl_bspline_workspace *bw; gsl_vector *B; gsl_vector *c; gsl_matrix *X, *cov; gsl_multifit_linear_workspace *mw; double chisq, Rsq, dof, tss; bw = gsl_bspline_alloc(4, nbreak); // allocate a cubic bspline workspace (k = 4) B = gsl_vector_alloc(ncoeffs); X = gsl_matrix_alloc(n, ncoeffs); c = gsl_vector_alloc(ncoeffs); cov = gsl_matrix_alloc(ncoeffs, ncoeffs); mw = gsl_multifit_linear_alloc(n, ncoeffs); gsl_bspline_knots_uniform(0.0, 15.0, bw); // use uniform breakpoints on [0, 15] for (i = 0; i < n; ++i) { // construct the fit matrix X double xi = gsl_vector_get(x, i); gsl_bspline_eval(xi, B, bw); // compute B_j(xi) for all j for (j = 0; j < ncoeffs; ++j) { // fill in row i of X double Bj = gsl_vector_get(B, j); gsl_matrix_set(X, i, j, Bj); } } gsl_multifit_wlinear(X, w, y, c, cov, &chisq, mw); // do the fit dof = n - ncoeffs; tss = gsl_stats_wtss(w->data, 1, y->data, 1, y->size); Rsq = 1.0 - chisq / tss; Rcpp::NumericVector FX(151), FY(151); // output the smoothed curve double xi, yi, yerr; for (xi = 0.0, i=0; xi < 15.0; xi += 0.1, i++) { gsl_bspline_eval(xi, B, bw); gsl_multifit_linear_est(B, c, cov, &yi, &yerr); FX[i] = xi; FY[i] = yi; } Rcpp::List res = Rcpp::List::create(Rcpp::Named("X")=FX, Rcpp::Named("Y")=FY, Rcpp::Named("chisqdof")=Rcpp::wrap(chisq/dof), Rcpp::Named("rsq")=Rcpp::wrap(Rsq)); gsl_bspline_free(bw); gsl_vector_free(B); gsl_matrix_free(X); gsl_vector_free(c); gsl_matrix_free(cov); gsl_multifit_linear_free(mw); y.free(); x.free(); w.free(); return(res); }
void bSplineGSLOriginalDemo () { const size_t n = N; const size_t ncoeffs = NCOEFFS; const size_t nbreak = NBREAK; size_t i, j; gsl_bspline_workspace *bw; gsl_vector *B; double dy; gsl_rng *r; gsl_vector *c, *w; gsl_vector *x, *y; gsl_matrix *X, *cov; gsl_multifit_linear_workspace *mw; double chisq, Rsq, dof, tss; vector<double> xControl, yControl, xFit, yFit; gsl_rng_env_setup(); r = gsl_rng_alloc(gsl_rng_default); /* allocate a cubic bspline workspace (k = 4) */ bw = gsl_bspline_alloc(4, nbreak); B = gsl_vector_alloc(ncoeffs); x = gsl_vector_alloc(n); y = gsl_vector_alloc(n); X = gsl_matrix_alloc(n, ncoeffs); c = gsl_vector_alloc(ncoeffs); w = gsl_vector_alloc(n); cov = gsl_matrix_alloc(ncoeffs, ncoeffs); mw = gsl_multifit_linear_alloc(n, ncoeffs); printf("#m=0,S=0\n"); /* this is the data to be fitted */ for (i = 0; i < n; ++i) { double sigma; double xi = (15.0 / (N - 1)) * i; double yi = cos(xi) * exp(-0.1 * xi); sigma = 0.1 * yi; dy = gsl_ran_gaussian(r, sigma); yi += dy; gsl_vector_set(x, i, xi); xControl.push_back(xi); gsl_vector_set(y, i, yi); yControl.push_back(yi); gsl_vector_set(w, i, 1.0 / (sigma * sigma)); printf("%f %f\n", xi, yi); } /* use uniform breakpoints on [0, 15] */ gsl_bspline_knots_uniform(0.0, 15.0, bw); /* construct the fit matrix X */ for (i = 0; i < n; ++i) { double xi = gsl_vector_get(x, i); /* compute B_j(xi) for all j */ gsl_bspline_eval(xi, B, bw); /* fill in row i of X */ for (j = 0; j < ncoeffs; ++j) { double Bj = gsl_vector_get(B, j); gsl_matrix_set(X, i, j, Bj); } } /* do the fit */ gsl_multifit_wlinear(X, w, y, c, cov, &chisq, mw); dof = n - ncoeffs; tss = gsl_stats_wtss(w->data, 1, y->data, 1, y->size); Rsq = 1.0 - chisq / tss; fprintf(stderr, "chisq/dof = %e, Rsq = %f\n", chisq / dof, Rsq); /* output the smoothed curve */ { double xi, yi, yerr; printf("#m=1,S=0\n"); for (xi = 0.0; xi < 15.0; xi += 0.1) { gsl_bspline_eval(xi, B, bw); gsl_multifit_linear_est(B, c, cov, &yi, &yerr); xFit.push_back(xi); yFit.push_back(yi); printf("%f %f\n", xi, yi); } } gsl_rng_free(r); gsl_bspline_free(bw); gsl_vector_free(B); gsl_vector_free(x); gsl_vector_free(y); gsl_matrix_free(X); gsl_vector_free(c); gsl_vector_free(w); gsl_matrix_free(cov); gsl_multifit_linear_free(mw); TGraph *gr = LoadGraphFromVectors(xControl, yControl); TGraph *grFit = LoadGraphFromVectors(xFit, yFit); gr->SetMarkerColor(kRed); TCanvas *c1 = new TCanvas("c1", "Graph", 200, 10, 700, 500); gr->Draw("apz"); grFit->Draw("SAME"); c1->Update(); }
/*============================================================================= * FITTING CODE *=============================================================================*/ int find_best_alpha(){ //double alpha_2pcf[num_alpha][nr], trials_2pcf[num_alpha][ntrials][total_nr], alpha_err[num_alpha][nr]; double **alpha_2pcf, ***trials_2pcf, **alpha_err; double low, high, da; long i,nend,k,j,ir,jk; double chi2; double yi,yerr,xi,minerr; int nbreak, iii,ind,min_ind,max_ind; long thisseed[Nalpha*num_alpha*ntrials]; #ifdef ALLOUT char Output2PCF[LINELENGTH]; char ThisFile[15]; #endif ncoeffs = num_alpha-1; nbreak =ncoeffs-2; // Allocate alphavec, which is our result //alphavec = (double *) calloc(Nalpha,sizeof(double)); //betavec = (double *) calloc(Nalpha,sizeof(double)); alpha_2pcf = (double **) calloc(num_alpha,sizeof(double *)); alpha_err = (double **) calloc(num_alpha,sizeof(double *)); trials_2pcf = (double ***) calloc(num_alpha,sizeof(double **)); for (i=0;i<num_alpha;i++){ alpha_2pcf[i] = (double *) calloc(nr,sizeof(double)); alpha_err[i] = (double *) calloc(nr,sizeof(double)); trials_2pcf[i] = (double **) calloc(ntrials,sizeof(double*)); for (j=0;j<ntrials;j++) trials_2pcf[i][j] = (double *) calloc(total_nr,sizeof(double)); } // allocate a cubic bspline workspace (k = 4) bw = gsl_bspline_alloc(4, nbreak); B = gsl_vector_alloc(ncoeffs); alpha_grid = gsl_vector_alloc(num_alpha); chi2_alpha = gsl_vector_alloc(num_alpha); X = gsl_matrix_alloc(num_alpha,ncoeffs); c = gsl_vector_alloc(ncoeffs); weights = gsl_vector_alloc(num_alpha); cov = gsl_matrix_alloc(ncoeffs, ncoeffs); mw = gsl_multifit_linear_alloc(num_alpha, ncoeffs); // Loop through each mass bin nend = 0; iii = 0; seed = time(NULL); for (i=0;i<Nalpha;i++){ for(j=0;j<num_alpha;j++){ for(k=0;k<ntrials;k++){ thisseed[iii] = seed + iii; iii++; } } } fprintf(stderr,"STARTING LOOPS...\n"); iii = 0; for (i=0;i<Nalpha;i++){ // Get where to place halos to nend += ncuts[i]; // Calculate a more optimum alpha_grid for this bin if (i < 2) low = alpha_ratio_1*best_alpha; else{ low = alpha_ratio*best_alpha; } high = 1.05*best_alpha; da = (high-low)/(num_alpha-1); fprintf(stderr,"STARTING THREADS\n"); #ifndef NO_PAR_FIT #pragma omp parallel for num_threads(nthreads) private(jk,j,k) \ shared(num_alpha,ntrials,i,alpha_grid,low,da,stderr,Nalpha,alphavec,iii,mcuts,ListOfParticles,\ NPartPerCell,x,y,z,Lbox,Npart,Nlin,HaloMass,nend,mpart,recalc_frac,betavec,thisseed,trials_2pcf,rho,maxr,\ total_nr,Nhalos) default(none) #endif for(jk=0;jk<num_alpha*ntrials;jk++){ fprintf(stderr,"Thread %d/%d\n",omp_get_thread_num(),omp_get_num_threads()); float *hx,*hy,*hz,*hR; double *thisalphavec; double *ercorr; unsigned long long *DD; hx = (float *) calloc(Nhalos,sizeof(float)); hy = (float *) calloc(Nhalos,sizeof(float)); hz = (float *) calloc(Nhalos,sizeof(float)); hR = (float *) calloc(Nhalos,sizeof(float)); thisalphavec = (double *) calloc(Nalpha,sizeof(double)); DD = (unsigned long long *) calloc(total_nr,sizeof(unsigned long long)); ercorr = (double *) calloc(total_nr,sizeof(double)); k=jk%ntrials; j=jk/ntrials; fprintf(stderr,"MOVED MEMORY\n"); fprintf(stderr,"GOT k,j: %ld, %ld\n",k,j); fprintf(stderr,"sizeof M : %f MB\n",(Nlin*Nlin*Nlin*sizeof(double)/1024./1024.)); //define the alpha grid for this mass bin gsl_vector_set(alpha_grid,j,low+j*da); // create a local alphavec, to which we add the current gridded alpha int itemp; for (itemp=0;itemp<Nalpha;itemp++) thisalphavec[itemp] = alphavec[itemp]; //fprintf(stderr,"mem copied\n"); thisalphavec[i] = gsl_vector_get(alpha_grid,j); // Place the halos #ifdef NO_PAR_FIT place_halos(nend,HaloMass, Nlin, Npart, x, y, z, NULL,NULL,NULL,Lbox, rho,thisseed[jk+i*num_alpha*ntrials], mpart,nthreads,thisalphavec, betavec, mcuts, Nalpha, recalc_frac,hx, hy, hz, NULL,NULL,NULL,hR,ListOfParticles,NPartPerCell); #else place_halos(nend,HaloMass, Nlin, Npart, x, y, z, NULL,NULL,NULL,Lbox, rho,thisseed[jk+i*num_alpha*ntrials], mpart,1,thisalphavec, betavec, mcuts, Nalpha, recalc_frac,hx, hy, hz, NULL,NULL,NULL,hR,ListOfParticles,NPartPerCell); #endif fprintf(stderr,"correlating...\n"); //Get the 2PCF correlate(nend, Lbox,hx,hy,hz,trials_2pcf[j][k], ercorr, DD,total_nr,maxr,1); fprintf(stderr,"...correlated\n"); free(hx); free(hy); free(hz); free(hR); free(thisalphavec); free(ercorr); free(DD); } for (jk=0;jk<num_alpha*ntrials;jk++){ k=jk%ntrials; j=jk/ntrials; fprintf(stderr,"RAWCORR %ld, %ld: %e\n",j,k,trials_2pcf[j][k][0]); } // #pragma omp parallel for private(ir,j,chi2,k) shared(num_alpha,stderr,i,nr,alpha_2pcf) default(none) fprintf(stderr,"GOT CORRELATIONS , GETTING CHI2...\n"); for(j=0;j<num_alpha;j++){ //Get mean and stdev of trials_2pcf chi2 = 0.0; for (ir=0;ir<nr;ir++){ alpha_2pcf[j][ir] = 0.0; for(k=0;k<ntrials;k++){ alpha_2pcf[j][ir] += trials_2pcf[j][k][ir+total_nr-nr-2]; } alpha_2pcf[j][ir] = alpha_2pcf[j][ir]/ntrials; alpha_err[j][ir] = 0.0; for(k=0;k<ntrials;k++){ alpha_err[j][ir] += pow((trials_2pcf[j][k][ir+total_nr-nr-2]-alpha_2pcf[j][ir]),2); } alpha_err[j][ir] = pow((alpha_err[j][ir]/(ntrials-1)),0.5); // Now get chi^2 values #ifdef REL_CHI2 chi2 += pow(((alpha_2pcf[j][ir]-nbody_2pcf[i][ir+total_nr-nr-2])/nbody_2pcf[i][ir+total_nr-nr-2]),2); #else chi2 += pow(((alpha_2pcf[j][ir]-nbody_2pcf[i][ir+total_nr-nr-2])/alpha_err[j][ir]),2); #endif fprintf(stderr,"%ld, %ld, %e, %e, %e, %e\n",j,ir,alpha_2pcf[j][ir],nbody_2pcf[i][ir+total_nr-nr-2],alpha_err[j][ir],chi2); } gsl_vector_set(chi2_alpha,j,chi2/nr); gsl_vector_set(weights,j,nr/chi2); } // #endif //NO_PARALLEL_FIT //*/ #ifdef ALLOUT //OUTPUT SOME THINGS FOR CHECKING sprintf(ThisFile,"/raw.2pcf.%ld",i); strcpy(Output2PCF,OutputDir); strcat(Output2PCF,ThisFile); FILE* output_2pcf; output_2pcf = fopen(Output2PCF,"w"); //header fprintf(output_2pcf,"# r, "); for (k=0;k<num_alpha;k++){ fprintf(output_2pcf,"%e\t",gsl_vector_get(alpha_grid,k)); } fprintf(output_2pcf,"\n"); //table for (ir=0;ir<nr;ir++){ fprintf(output_2pcf,"%e\t",(ir+total_nr-nr+0.5)*maxr/total_nr); for(k=0;k<num_alpha-1;k++){ fprintf(output_2pcf,"%e\t",alpha_2pcf[k][ir]); } fprintf(output_2pcf,"%e\n",alpha_2pcf[num_alpha-1][ir]); } fclose(output_2pcf); sprintf(ThisFile,"/raw.err.%ld",i); strcpy(Output2PCF,OutputDir); strcat(Output2PCF,ThisFile); FILE* output_err; output_err = fopen(Output2PCF,"w"); //header fprintf(output_err,"# r, "); for (k=0;k<num_alpha;k++){ fprintf(output_err,"%e\t",gsl_vector_get(alpha_grid,k)); } fprintf(output_err,"\n"); //table for (ir=0;ir<nr;ir++){ fprintf(output_err,"%e\t",(ir+total_nr-nr+0.5)*maxr/total_nr); for(k=0;k<num_alpha-1;k++){ fprintf(output_err,"%e\t",alpha_err[k][ir]); } fprintf(output_err,"%e\n",alpha_err[num_alpha-1][ir]); } fclose(output_err); sprintf(ThisFile,"/chi2.%ld",i); strcpy(Output2PCF,OutputDir); strcat(Output2PCF,ThisFile); FILE* chifile; chifile = fopen(Output2PCF,"w"); fprintf(chifile,"# alpha, chi2, weight\n"); for (k=0;k<num_alpha;k++){ fprintf(chifile,"%e\t%e\t%e\n",gsl_vector_get(alpha_grid,k),gsl_vector_get(chi2_alpha,k), gsl_vector_get(weights,k)); } fclose(chifile); #endif // Check if final value or initial value is the smallest minerr = gsl_vector_get(chi2_alpha,0); ind = 0; for(k=1;k<num_alpha;k++){ if(minerr>gsl_vector_get(chi2_alpha,k)){ minerr = gsl_vector_get(chi2_alpha,k); ind = k; } } if(ind==0){ fprintf(stderr,"ERROR: alpha_grid doesn't extend low enough, set alpha_ratio lower"); } if(ind==num_alpha-1){ fprintf(stderr,"ERROR: alpha_grid doesn't extend high enough, set best_alpha higher"); } if (ind>=2){ min_ind = ind-2; }else{ min_ind = 0; } if (ind<=num_alpha-3){ max_ind = ind+2; }else{ max_ind = num_alpha-1; } /* use uniform breakpoints on interval */ gsl_bspline_knots_uniform(gsl_vector_get(alpha_grid,0), gsl_vector_get(alpha_grid,num_alpha-1), bw); /* construct the fit matrix X */ for (k = 0; k < num_alpha; ++k){ double xi = gsl_vector_get(alpha_grid, k); /* compute B_j(xi) for all j */ gsl_bspline_eval(xi, B, bw); /* fill in row i of X */ for (j = 0; j < ncoeffs; ++j){ double Bj = gsl_vector_get(B, j); gsl_matrix_set(X, k, j, Bj); } } fprintf(stderr,"Got to the fit part\n"); /* do the fit */ gsl_multifit_wlinear(X, weights, chi2_alpha, c, cov, &chisq, mw); // PRINT OUT EVERYTHING WE HAVE SO FAR fprintf(stderr,"alpha\tchi2_alpha\t\n"); for (k=0;k<num_alpha;k++){ fprintf(stderr,"%e\t%e\t\n",gsl_vector_get(alpha_grid,k), gsl_vector_get(chi2_alpha,k)); } #ifdef VERB dof = num_alpha - ncoeffs; tss = gsl_stats_wtss(weights->data, 1, chi2_alpha->data, 1, chi2_alpha->size); Rsq = 1.0 - chisq / tss; fprintf(stderr, "chisq/dof = %e, Rsq = %f\n",chisq / dof, Rsq); #endif for (xi=gsl_vector_get(alpha_grid,0);xi<gsl_vector_get(alpha_grid,num_alpha-1);xi+=0.01){ gsl_bspline_eval(xi, B, bw); gsl_multifit_linear_est(B, c, cov, &yi, &yerr); fprintf(stderr,"%e\t%e\t%e\n",xi,yi,gsl_vector_get(B,0)); } //DO THE MINIMIZATION alphavec[i] = minimize(gsl_vector_get(alpha_grid,min_ind), gsl_vector_get(alpha_grid,max_ind), gsl_vector_get(alpha_grid,ind)); best_alpha = alphavec[i]; fprintf(stderr,"\n Best alpha: %f\n\n",best_alpha); } return 0; }
//spline locations held fixed in Mpc^-1; CMB basically fixed P(k) in these units void dopksmoothbspline_(double *kvals, double *lnpklinear, double *lnpksmooth, int *npts) { double kmaxsuppress = 0.01*0.7; size_t n, ncoeffs, nbreak; gsl_bspline_workspace *bw; gsl_vector *B; gsl_vector *c, *w, *x, *y; gsl_matrix *X, *cov; gsl_multifit_linear_workspace *mw; double deltak,lastk; int i,j,countkeep; nbreak = 9; gsl_vector *mybreaks = gsl_vector_alloc(nbreak); gsl_vector_set(mybreaks,0,(0.001*0.7)); gsl_vector_set(mybreaks,1,(0.025*0.7)); gsl_vector_set(mybreaks,2,(0.075*0.7)); gsl_vector_set(mybreaks,3,(0.125*0.7)); gsl_vector_set(mybreaks,4,(0.175*0.7)); gsl_vector_set(mybreaks,5,(0.225*0.7)); gsl_vector_set(mybreaks,6,(0.275*0.7)); gsl_vector_set(mybreaks,7,(0.325*0.7)); gsl_vector_set(mybreaks,8,(0.375*0.7)); countkeep = 0; for(i=0;i<(*npts);i++) { if((kvals[i]) >= gsl_vector_get(mybreaks,0) && (kvals[i]) <= gsl_vector_get(mybreaks,nbreak-1)) { countkeep += 1; } } n = countkeep; ncoeffs = nbreak + 2; /* allocate a cubic bspline workspace (k = 4) */ bw = gsl_bspline_alloc(4, nbreak); B = gsl_vector_alloc(ncoeffs); x = gsl_vector_alloc(n); y = gsl_vector_alloc(n); X = gsl_matrix_alloc(n, ncoeffs); c = gsl_vector_alloc(ncoeffs); w = gsl_vector_alloc(n); cov = gsl_matrix_alloc(ncoeffs, ncoeffs); mw = gsl_multifit_linear_alloc(n, ncoeffs); i=0; for(j=0;j<(*npts);j++) { if((kvals[j]) >= gsl_vector_get(mybreaks,0) && (kvals[j]) <= gsl_vector_get(mybreaks,nbreak-1)) { gsl_vector_set(x,i,(kvals[j])); gsl_vector_set(y,i,exp(lnpklinear[j])*pow(kvals[j],1.5)); if(j>0) { deltak = kvals[j] - kvals[j-1]; } else { deltak = kvals[0]; if(kvals[1] - kvals[0] < deltak) { deltak = kvals[1]-kvals[0]; } } gsl_vector_set(w,i,deltak); i+=1; } } gsl_bspline_knots(mybreaks,bw); for(i=0;i<n;i++) { double xi = gsl_vector_get(x,i); gsl_bspline_eval(xi,B,bw); for(j=0;j<ncoeffs;j++) { double Bj = gsl_vector_get(B,j); gsl_matrix_set(X,i,j,Bj); } } //do fit double yi,yierr,chisq; gsl_multifit_wlinear(X,w,y,c,cov,&chisq,mw); i = 0; for(j=0;j<(*npts);j++) { if((kvals[j]) >= gsl_vector_get(mybreaks,0) && (kvals[j]) <= gsl_vector_get(mybreaks,nbreak-1)) { gsl_bspline_eval(gsl_vector_get(x,i),B,bw); gsl_multifit_linear_est(B,c,cov,&yi,&yierr); lnpksmooth[j] = log(yi*pow(kvals[j],-1.5)); i += 1; } else { lnpksmooth[j] = lnpklinear[j]; } //spline is wacky at small k -- suppress difference at k < 0.01 if(kvals[j] < kmaxsuppress) { lnpksmooth[j] = lnpklinear[j]; } } assert(i==n); gsl_bspline_free(bw); gsl_vector_free(B); gsl_vector_free(x); gsl_vector_free(y); gsl_vector_free(mybreaks); gsl_matrix_free(X); gsl_vector_free(c); gsl_vector_free(w); gsl_matrix_free(cov); gsl_multifit_linear_free(mw); }