6 #include <gsl/gsl_errno.h>
7 #include <gsl/gsl_sf.h>
8 #include <gsl/gsl_siman.h>
9 #include <gsl/gsl_randist.h>
14 #define J_END_COL(i) \
15 for (j=0; j<N; j++) gsl_matrix_set(J,i,j,J_COL[j]);
17 static inline _Bool IS_SMALL(double v) {
21 static inline double sinc(double x) {
22 return gsl_sf_sinc(x / M_PI);
25 static double target[N];
27 static double cb_Efunc(void *xp) {
33 for (i=0, e=0; i<N; i++) {
34 double d = F[i] - target[i];
37 //printf("\n cb_Efunc %p %10.7f [", xp, e);
38 //for (i=0; i<N; i++) printf(" %10.7f,", x[i]);
43 static void cb_step(const gsl_rng *rng, void *xp, double step_size) {
47 gsl_ran_dir_nd(rng, N,step);
49 x[i] += step_size * step[i];
50 //printf("\n cb_step %p %10.7f [", xp, step_size);
51 //for (i=0; i<N; i++) printf(" %10.7f,", step[i]);
55 static double cb_metric(void *xp, void *yp) {
56 const double *x=xp, *y=yp;
59 for (i=0, s=0; i<N; i++) {
60 double d = x[i] - y[i];
66 static void printcore(const double *x) {
72 for (i=0; i<6; i++) printf(" %.18g,", x[i]);
73 for (i=0; i<6; i++) printf(" %.18g,", F[i]);
77 static void __attribute__((unused)) cb_print(void *xp) {
83 static double scan1double(void) {
88 if (ferror(stdin)) { perror("stdin"); exit(-1); }
89 if (feof(stdin)) exit(0);
90 if (r!=1) { fputs("bad input\n",stderr); exit(-1); }
100 gsl_rng *rng = gsl_rng_alloc(gsl_rng_ranlxd2);
103 /* 2N+1 doubles: target, initial guess, epsilon for residual */
105 target[i] = scan1double();
107 startpoint[i] = scan1double();
108 epsilon = scan1double();
112 gsl_siman_params_t siman_params = {
116 .t_min = epsilon * 1E-3,
117 .iters_fixed_T = 100,
124 cb_Efunc, cb_step, cb_metric,
126 0,0,0, sizeof(startpoint), siman_params);
128 printcore(startpoint);