傅立叶变换—FFT(cuda实现)

#include "stdio.h"
#include "cuda_runtime.h"
#include "cufft.h"
#include "device_launch_parameters.h"


#define LENGTH 4
int main()
{

    float Data[LENGTH] = {1,2,3,4};
    cufftComplex *CompData=(cufftComplex*)malloc(LENGTH*sizeof(cufftComplex));
    int i;
    for(i=0;i<LENGTH;i++)
    {
        CompData[i].x=Data[i];
        CompData[i].y=0;
    }

    cufftComplex *d_fftData;
    cudaMalloc((void**)&d_fftData,LENGTH*sizeof(cufftComplex));
    cudaMemcpy(d_fftData,CompData,LENGTH*sizeof(cufftComplex),cudaMemcpyHostToDevice);

    cufftHandle plan;
    cufftPlan1d(&plan,LENGTH,CUFFT_C2C,1);
    cufftExecC2C(plan,(cufftComplex*)d_fftData,(cufftComplex*)d_fftData,CUFFT_FORWARD);
    cudaDeviceSynchronize();
    cudaMemcpy(CompData,d_fftData,LENGTH*sizeof(cufftComplex),cudaMemcpyDeviceToHost);
 
  for(i=0;i<LENGTH;i++)
  {
    if(CompData[i].x != 0)
    {
      printf("%3.1f",CompData[i].x);
    }
    if(CompData[i].y != 0 )
    {
      printf("+%3.1fi",CompData[i].y);
    } 
    printf("\n");
  }
     cufftDestroy(plan);
     free(CompData);
     cudaFree(d_fftData);

}