00001 #include <stdlib.h>
00002
00003 #include "util.h"
00004 #include "nfft3.h"
00005
00015 void construct(char * file, int N, int M)
00016 {
00017 int j,k;
00018 double real;
00019 nfft_plan my_plan;
00020 FILE* fp;
00021 FILE* fk;
00022 FILE* fi;
00023
00024
00025 nfft_init_2d(&my_plan,N,N,M);
00026
00027 fp=fopen("knots.dat","r");
00028
00029 for(j=0;j<my_plan.M_total;j++)
00030 {
00031 fscanf(fp,"%le %le ",&my_plan.x[2*j+0],&my_plan.x[2*j+1]);
00032 }
00033 fclose(fp);
00034
00035 fi=fopen("input_f.dat","r");
00036 fk=fopen(file,"w");
00037
00038 for(j=0;j<N;j++)
00039 {
00040 for(k=0;k<N;k++) {
00041 fscanf(fi,"%le ",&real);
00042 my_plan.f_hat[(N*j+k)] = real;
00043 }
00044 }
00045
00046 if(my_plan.nfft_flags & PRE_PSI)
00047 nfft_precompute_psi(&my_plan);
00048
00049 nfft_trafo(&my_plan);
00050
00051 for(j=0;j<my_plan.M_total;j++)
00052 {
00053 fprintf(fk,"%le %le %le %le\n",my_plan.x[2*j+0],my_plan.x[2*j+1],creal(my_plan.f[j]),cimag(my_plan.f[j]));
00054 }
00055 fclose(fk);
00056 fclose(fi);
00057
00058 nfft_finalize(&my_plan);
00059 }
00060
00061 int main(int argc, char **argv)
00062 {
00063 if (argc <= 3) {
00064 printf("usage: ./construct_data FILENAME N M\n");
00065 return 1;
00066 }
00067
00068 construct(argv[1],atoi(argv[2]),atoi(argv[3]));
00069
00070 return 1;
00071 }
00072
