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00021 #include <math.h>
00022 #include <stdlib.h>
00023 #include <complex.h>
00024
00025 #include "nfft3util.h"
00026 #include "nfft3.h"
00027
00028 void accuracy(int d)
00029 {
00030 int m,t;
00031 nnfft_plan my_plan;
00032 double _Complex *slow;
00033
00034 int N[d],n[d];
00035 int M_total,N_total;
00036 M_total=10000;N_total=1;
00037
00038 slow=(double _Complex*)nfft_malloc(M_total*sizeof(double _Complex));
00039
00040 for(t=0; t<d; t++)
00041 {
00042 N[t]=(1<<(12/d));
00043 n[t]=2*N[t];
00044 N_total*=N[t];
00045 }
00046
00048 for(m=0; m<10; m++)
00049 {
00050 nnfft_init_guru(&my_plan, d, N_total, M_total, N, n, m,
00051 PRE_PSI| PRE_PHI_HUT|
00052 MALLOC_X| MALLOC_V| MALLOC_F_HAT| MALLOC_F);
00053
00054
00056 nfft_vrand_shifted_unit_double(my_plan.x, d*my_plan.M_total);
00057 nfft_vrand_shifted_unit_double(my_plan.v, d*my_plan.N_total);
00058
00060 if(my_plan.nnfft_flags & PRE_PSI)
00061 nnfft_precompute_psi(&my_plan);
00062
00063 if(my_plan.nnfft_flags & PRE_LIN_PSI)
00064 nnfft_precompute_lin_psi(&my_plan);
00065
00066 if(my_plan.nnfft_flags & PRE_FULL_PSI)
00067 nnfft_precompute_full_psi(&my_plan);
00068
00070 if(my_plan.nnfft_flags & PRE_PHI_HUT)
00071 nnfft_precompute_phi_hut(&my_plan);
00072
00074 nfft_vrand_unit_complex(my_plan.f_hat, my_plan.N_total);
00075
00077 nndft_trafo(&my_plan);
00078
00079 NFFT_SWAP_complex(my_plan.f,slow);
00080
00082 nnfft_trafo(&my_plan);
00083
00084 printf("%e, %e\n",
00085 nfft_error_l_infty_complex(slow, my_plan.f, M_total),
00086 nfft_error_l_infty_1_complex(slow, my_plan.f, M_total, my_plan.f_hat,
00087 my_plan.N_total));
00088
00090 nnfft_finalize(&my_plan);
00091 }
00092 }
00093
00094 int main(void)
00095 {
00096 int d;
00097 for(d=1; d<4; d++)
00098 accuracy(d);
00099
00100 return 1;
00101 }