static void simple_test_nnfft_2d(void)
{
int j,k; /**< index for nodes and freqencies */
nnfft_plan my_plan; /**< plan for the nfft */
int N[2];
N[0]=12;
N[1]=14;
/** init an one dimensional plan */
nnfft_init(&my_plan, 2,12*14,19, N);
/** init pseudo random nodes */
for(j=0;j<my_plan.M_total;j++)
{
my_plan.x[2*j]=((double)rand())/((double)RAND_MAX)-0.5;
my_plan.x[2*j+1]=((double)rand())/((double)RAND_MAX)-0.5;
}
/** init pseudo random nodes */
for(j=0;j<my_plan.N_total;j++)
{
my_plan.v[2*j]=((double)rand())/((double)RAND_MAX)-0.5;
my_plan.v[2*j+1]=((double)rand())/((double)RAND_MAX)-0.5;
}
/** precompute psi, the entries of the matrix B */
if(my_plan.nnfft_flags & PRE_PSI)
nnfft_precompute_psi(&my_plan);
if(my_plan.nnfft_flags & PRE_FULL_PSI)
nnfft_precompute_full_psi(&my_plan);
if(my_plan.nnfft_flags & PRE_LIN_PSI)
nnfft_precompute_lin_psi(&my_plan);
/** precompute phi_hut, the entries of the matrix D */
if(my_plan.nnfft_flags & PRE_PHI_HUT)
nnfft_precompute_phi_hut(&my_plan);
/** init pseudo random Fourier coefficients and show them */
for(k=0;k<my_plan.N_total;k++)
my_plan.f_hat[k] = ((double)rand())/((double)RAND_MAX) + _Complex_I*((double)rand())/((double)RAND_MAX);
nfft_vpr_complex(my_plan.f_hat,12,
"given Fourier coefficients, vector f_hat (first 12 entries)");
/** direct trafo and show the result */
nnfft_trafo_direct(&my_plan);
nfft_vpr_complex(my_plan.f,my_plan.M_total,"ndft, vector f");
/** approx. trafo and show the result */
nnfft_trafo(&my_plan);
nfft_vpr_complex(my_plan.f,my_plan.M_total,"nfft, vector f");
/** finalise the one dimensional plan */
nnfft_finalize(&my_plan);
}
static void simple_test_adjoint_nnfft_1d(void)
{
int j; /**< index for nodes and freqencies */
nnfft_plan my_plan; /**< plan for the nfft */
int N[1];
N[0]=12;
/** init an one dimensional plan */
nnfft_init(&my_plan, 1, 20, 33, N);
/** init pseudo random nodes */
for(j=0;j<my_plan.M_total;j++)
{
my_plan.x[j]=((double)rand())/((double)RAND_MAX)-0.5;
}
/** init pseudo random nodes */
for(j=0;j<my_plan.N_total;j++)
{
my_plan.v[j]=((double)rand())/((double)RAND_MAX)-0.5;
}
/** precompute psi, the entries of the matrix B */
if(my_plan.nnfft_flags & PRE_PSI)
nnfft_precompute_psi(&my_plan);
if(my_plan.nnfft_flags & PRE_FULL_PSI)
nnfft_precompute_full_psi(&my_plan);
if(my_plan.nnfft_flags & PRE_LIN_PSI)
nnfft_precompute_lin_psi(&my_plan);
/** precompute phi_hut, the entries of the matrix D */
if(my_plan.nnfft_flags & PRE_PHI_HUT)
nnfft_precompute_phi_hut(&my_plan);
/** init pseudo random Fourier coefficients and show them */
for(j=0;j<my_plan.M_total;j++)
my_plan.f[j] = ((double)rand())/((double)RAND_MAX) + _Complex_I*((double)rand())/((double)RAND_MAX);
nfft_vpr_complex(my_plan.f,my_plan.M_total,"given Samples, vector f");
/** direct trafo and show the result */
nnfft_adjoint_direct(&my_plan);
nfft_vpr_complex(my_plan.f_hat,my_plan.N_total,"adjoint nndft, vector f_hat");
/** approx. trafo and show the result */
nnfft_adjoint(&my_plan);
nfft_vpr_complex(my_plan.f_hat,my_plan.N_total,"adjoint nnfft, vector f_hat");
/** finalise the one dimensional plan */
nnfft_finalize(&my_plan);
}
/**
* reconstruct
*/
static void reconstruct(char* filename,int N,int M,int iteration, int weight)
{
int j,k,l; /* some variables */
nnfft_plan my_plan; /* plan for the two dimensional nfft */
solver_plan_complex my_iplan; /* plan for the two dimensional infft */
FILE* fin; /* input file */
FILE* finh;
FILE* ftime;
FILE* fout_real; /* output file */
FILE* fout_imag; /* output file */
int my_N[3],my_n[3]; /* to init the nfft */
double t0, t1;
double t,epsilon=0.0000003; /* epsilon is a the break criterium for
the iteration */
unsigned infft_flags = CGNR | PRECOMPUTE_DAMP; /* flags for the infft*/
double time,min_time,max_time,min_inh,max_inh;
double real,imag;
double *w;
double Ts;
double W;
int N3;
int m=2;
double sigma = 1.25;
w = (double*)nfft_malloc(N*N*sizeof(double));
ftime=fopen("readout_time.dat","r");
finh=fopen("inh.dat","r");
min_time=INT_MAX; max_time=INT_MIN;
for(j=0;j<M;j++)
{
fscanf(ftime,"%le ",&time);
if(time<min_time)
min_time = time;
if(time>max_time)
max_time = time;
}
fclose(ftime);
Ts=(min_time+max_time)/2.0;
min_inh=INT_MAX; max_inh=INT_MIN;
for(j=0;j<N*N;j++)
{
fscanf(finh,"%le ",&w[j]);
if(w[j]<min_inh)
min_inh = w[j];
if(w[j]>max_inh)
max_inh = w[j];
}
fclose(finh);
N3=ceil((MAX(fabs(min_inh),fabs(max_inh))*(max_time-min_time)/2.0)*4);
W=MAX(fabs(min_inh),fabs(max_inh))*2.0;
fprintf(stderr,"3: %i %e %e %e %e %e %e\n",N3,W,min_inh,max_inh,min_time,max_time,Ts);
/* initialise my_plan */
my_N[0]=N;my_n[0]=ceil(N*sigma);
my_N[1]=N; my_n[1]=ceil(N*sigma);
my_N[2]=N3; my_n[2]=ceil(N3*sigma);
nnfft_init_guru(&my_plan, 3, N*N, M, my_N,my_n,m,
PRE_PSI| PRE_PHI_HUT| MALLOC_X| MALLOC_V| MALLOC_F_HAT| MALLOC_F );
/* precompute lin psi if set */
if(my_plan.nnfft_flags & PRE_LIN_PSI)
nnfft_precompute_lin_psi(&my_plan);
/* set the flags for the infft*/
if (weight)
infft_flags = infft_flags | PRECOMPUTE_WEIGHT;
/* initialise my_iplan, advanced */
solver_init_advanced_complex(&my_iplan,(nfft_mv_plan_complex*)(&my_plan), infft_flags );
/* get the weights */
if(my_iplan.flags & PRECOMPUTE_WEIGHT)
{
fin=fopen("weights.dat","r");
for(j=0;j<my_plan.M_total;j++)
{
fscanf(fin,"%le ",&my_iplan.w[j]);
}
fclose(fin);
}
/* get the damping factors */
if(my_iplan.flags & PRECOMPUTE_DAMP)
{
for(j=0;j<N;j++){
for(k=0;k<N;k++) {
int j2= j-N/2;
int k2= k-N/2;
double r=sqrt(j2*j2+k2*k2);
if(r>(double) N/2)
my_iplan.w_hat[j*N+k]=0.0;
else
my_iplan.w_hat[j*N+k]=1.0;
}
}
}
/* open the input file */
fin=fopen(filename,"r");
ftime=fopen("readout_time.dat","r");
for(j=0;j<my_plan.M_total;j++)
{
fscanf(fin,"%le %le %le %le ",&my_plan.x[3*j+0],&my_plan.x[3*j+1],&real,&imag);
my_iplan.y[j]=real+ _Complex_I*imag;
fscanf(ftime,"%le ",&my_plan.x[3*j+2]);
my_plan.x[3*j+2] = (my_plan.x[3*j+2]-Ts)*W/N3;
}
for(j=0;j<N;j++)
{
for(l=0;l<N;l++)
{
my_plan.v[3*(N*j+l)+0]=(((double) j) -(((double) N)/2.0))/((double) N);
my_plan.v[3*(N*j+l)+1]=(((double) l) -(((double) N)/2.0))/((double) N);
my_plan.v[3*(N*j+l)+2] = w[N*j+l]/W ;
}
}
/* precompute psi */
if(my_plan.nnfft_flags & PRE_PSI) {
nnfft_precompute_psi(&my_plan);
if(my_plan.nnfft_flags & PRE_FULL_PSI)
nnfft_precompute_full_psi(&my_plan);
}
if(my_plan.nnfft_flags & PRE_PHI_HUT)
nnfft_precompute_phi_hut(&my_plan);
/* init some guess */
for(k=0;k<my_plan.N_total;k++)
{
my_iplan.f_hat_iter[k]=0.0;
}
t0 = nfft_clock_gettime_seconds();
/* inverse trafo */
solver_before_loop_complex(&my_iplan);
for(l=0;l<iteration;l++)
{
/* break if dot_r_iter is smaller than epsilon*/
if(my_iplan.dot_r_iter<epsilon)
break;
fprintf(stderr,"%e, %i of %i\n",sqrt(my_iplan.dot_r_iter),
l+1,iteration);
solver_loop_one_step_complex(&my_iplan);
}
t1 = nfft_clock_gettime_seconds();
t = t1-t0;
fout_real=fopen("output_real.dat","w");
fout_imag=fopen("output_imag.dat","w");
for(k=0;k<my_plan.N_total;k++) {
my_iplan.f_hat_iter[k]*=cexp(2.0*_Complex_I*M_PI*Ts*w[k]);
fprintf(fout_real,"%le ", creal(my_iplan.f_hat_iter[k]));
fprintf(fout_imag,"%le ", cimag(my_iplan.f_hat_iter[k]));
}
fclose(fout_real);
fclose(fout_imag);
/* finalize the infft */
solver_finalize_complex(&my_iplan);
/* finalize the nfft */
nnfft_finalize(&my_plan);
nfft_free(w);
}
void accuracy(int d)
{
int m,t;
nnfft_plan my_plan;
double complex *slow;
int N[d],n[d];
int M_total,N_total;
M_total=10000;N_total=1;
slow=(double complex*)fftw_malloc(M_total*sizeof(double complex));
for(t=0; t<d; t++)
{
N[t]=(1<<(12/d));
n[t]=2*N[t];
N_total*=N[t];
}
/** init a plan */
for(m=0; m<10; m++)
{
nnfft_init_guru(&my_plan, d, N_total, M_total, N, n, m,
PRE_PSI| PRE_PHI_HUT|
MALLOC_X| MALLOC_V| MALLOC_F_HAT| MALLOC_F);
/** init pseudo random nodes */
nfft_vrand_shifted_unit_double(my_plan.x, d*my_plan.M_total);
nfft_vrand_shifted_unit_double(my_plan.v, d*my_plan.N_total);
/** precompute psi, the entries of the matrix B */
if(my_plan.nnfft_flags & PRE_PSI)
nnfft_precompute_psi(&my_plan);
if(my_plan.nnfft_flags & PRE_LIN_PSI)
nnfft_precompute_lin_psi(&my_plan);
if(my_plan.nnfft_flags & PRE_FULL_PSI)
nnfft_precompute_full_psi(&my_plan);
/** precompute psi, the entries of the matrix D */
if(my_plan.nnfft_flags & PRE_PHI_HUT)
nnfft_precompute_phi_hut(&my_plan);
/** init pseudo random Fourier coefficients */
nfft_vrand_unit_complex(my_plan.f_hat, my_plan.N_total);
/** direct trafo and show the result */
nndft_trafo(&my_plan);
NFFT_SWAP_complex(my_plan.f,slow);
/** approx. trafo and show the result */
nnfft_trafo(&my_plan);
printf("%e, %e\n",
nfft_error_l_infty_complex(slow, my_plan.f, M_total),
nfft_error_l_infty_1_complex(slow, my_plan.f, M_total, my_plan.f_hat,
my_plan.N_total));
/** finalise the one dimensional plan */
nnfft_finalize(&my_plan);
}
}