问用FFTW3和C++求高斯函数的傅里叶变换

EN

main(int argc, char** argv)
{
   fftw_plan p;
   complex<double> *in,*out;
   long N=8;

   //allocation of in and the fftw plan called 
   in=(complex<double>*) calloc(N,sizeof(complex<double>));
   p=fftw_plan_dft_1d(N,(fftw_complex*)in,(fftw_complex*)in,FFTW_BACKWARD,FFTW_ESTIMATE);

   //initialize the array in with the values of a Gaussian function
   gaussianf(in,N);
   //Fourier transform in
   fftw_execute(p);  
   //write the result into a file
   writeft(in,N);
   fftw_destroy_plan(p);
}

#input values
#x       real part     imag part

-10     3.72008e-44     0
-7.5    3.72336e-25     0
-5      1.38879e-11     0
-2.5    0.00193045      0
0       1       0
2.5     0.00193045      0
5       1.38879e-11     0
7.5     3.72336e-25     0

#output
#x       real part     imag part
-10     1.00386 0
-7.5    -1.00273        0
-5      1       0
-2.5    -0.99727        0
0       0.996139        0
2.5     -0.99727        0
5       1       0
7.5     -1.00273        0