10.0的話，語法有相當大的改變，此外相對於6.0在做IFFT的時候還要提前設定scale因子，一般為1/n.

1.   在6.0中，申請3*n大小的變數wsave,然後進行傅立葉變換即可：

      CFFT1DC(rr, ri, n, 0, wsave);
      CFFT1DC(rr, ri, n, isign, wsave);  //isign =-1為FFT， isign = 1為 IFFT

2.  在10.0中，傅立葉變換的步驟是

  1） 變數名稱，mkl_float_complex*

  2）/* Create Dfti descriptor for 1D single precision  transform
*/
Status = DftiCreateDescriptor( &Desc_Handle, DFTI_SINGLE,
DFTI_COMPLEX, 1, n );

  3）/*   Commit Dfti descriptor
*/
Status = DftiCommitDescriptor( Desc_Handle );
if(! DftiErrorClass(Status, DFTI_NO_ERROR)){
dfti_example_status_print(Status);
printf(" TEST FAIL\n"); goto FREE_DESCRIPTOR;
}

   4）/*   Compute Forward transform
*/

Status = DftiComputeForward( Desc_Handle, x_in);
if(! DftiErrorClass(Status, DFTI_NO_ERROR)){
dfti_example_status_print(Status);
printf(" TEST FAIL\n"); goto FREE_DESCRIPTOR;
}

   5）/*   Set Scale number for Backward transform
*/
Scale = 1.0/(float)n;
Status = DftiSetValue(Desc_Handle, DFTI_BACKWARD_SCALE, Scale);
if(! DftiErrorClass(Status, DFTI_NO_ERROR)){
dfti_example_status_print(Status);
printf(" TEST FAIL\n"); goto FREE_DESCRIPTOR;
}

   6）/*
/   Commit Dfti descriptor
*/
Status = DftiCommitDescriptor( Desc_Handle );
if(! DftiErrorClass(Status, DFTI_NO_ERROR)){
dfti_example_status_print(Status);
printf(" TEST FAIL\n"); goto FREE_DESCRIPTOR;
}
/*
/   Compute Backward transform
*/
printf("\n Compute DftiComputeBackward\n\n");
Status = DftiComputeBackward( Desc_Handle, x_in);
if(! DftiErrorClass(Status, DFTI_NO_ERROR)){
dfti_example_status_print(Status);
printf(" TEST FAIL\n"); goto FREE_DESCRIPTOR;
}

   7）釋放描述器資源

       Status = DftiFreeDescriptor(&Desc_Handle);
if(! DftiErrorClass(Status, DFTI_NO_ERROR)){
dfti_example_status_print(Status);
printf(" TEST FAIL\n");
}