40 static void reconstruct(
char* filename, 
int N, 
int M, 
int weight)
 
   51   int flags = PRE_PHI_HUT| PRE_PSI |MALLOC_X| MALLOC_F_HAT|
 
   52                       MALLOC_F| FFTW_INIT| FFT_OUT_OF_PLACE|
 
   53                       FFTW_MEASURE| FFTW_DESTROY_INPUT;
 
   56   my_N[0]=N; my_n[0]=ceil(N*1.2);
 
   57   my_N[1]=N; my_n[1]=ceil(N*1.2);
 
   58   nfft_init_guru(&my_plan, 2, my_N, M, my_n, 6,flags,
 
   59                       FFTW_MEASURE| FFTW_DESTROY_INPUT);
 
   61   fin=fopen(filename,
"r");
 
   63   fweight=fopen(
"weights.dat",
"r");
 
   66     fscanf(fweight,
"%le ",&weights);
 
   67     fscanf(fin,
"%le %le %le %le",&my_plan.
x[2*j+0],&my_plan.
x[2*j+1],&real,&imag);
 
   68     my_plan.
f[j] = real + _Complex_I*imag;
 
   70       my_plan.
f[j] = my_plan.
f[j] * weights;
 
   76     nfft_precompute_psi(&my_plan);
 
   80     nfft_precompute_full_psi(&my_plan);
 
   84   nfft_adjoint(&my_plan);
 
   86   fout_real=fopen(
"output_real.dat",
"w");
 
   87   fout_imag=fopen(
"output_imag.dat",
"w");
 
   90     fprintf(fout_real,
"%le ",creal(my_plan.
f_hat[j]));
 
   91     fprintf(fout_imag,
"%le ",cimag(my_plan.
f_hat[j]));
 
   98   nfft_finalize(&my_plan);
 
  102 int main(
int argc, 
char **argv)
 
  105     printf(
"usage: ./reconstruct_data_gridding FILENAME N M ITER WEIGHTS\n");
 
  108   reconstruct(argv[1],atoi(argv[2]),atoi(argv[3]),atoi(argv[5]));