kml_ffth_plan_dft_scale_c2r_2d

Create a plan for the two-dimensional C2R transform of a single contiguous data array.

Interface Definition

C interface:

kml_ffth_plan kml_ffth_plan_dft_scale_c2r_2d(int n0, int n1, kml_ffth_complex *in, float *out, unsigned flags);

Return Value

The function returns a structure pointer of the kml_ffth_plan type. This object can be passed to the kml_fft(f/h)_execute function as a parameter to perform FFT on the current input and output. This object can also be passed to the kml_ffth_execute_dft_scale_c2r function as a parameter to perform FFT on new input and output.

If this function returns a non-null pointer, the plan has been successfully created. Otherwise, the plan fails to be created.

Parameters

Parameter	Data Type	Description	Input/Output
n0	int	Inputs the size of the first dimension in the FFT array. The constraint is n0 ≥ 1.	Input
n1	int	Inputs the size of the second dimension in the FFT array. The constraint is n1 ≥ 1.	Input
in	kml_ffth_complex*	Inputs the data to be transformed.	Input
out	float*	Outputs the data generated using FFT.	Output
flags	unsigned int	Planning option, which describes the ESTIMATE or PATIENT mode. KML_FFT_ESTIMATE: ESTIMATE mode KML_FFT_PATIENT: PATIENT mode	Input

Dependencies

C: "kfft.h"

Examples

C interface:

    int n0 = 4; 
    int n1 = 4; 
    __fp16 init[12][2] = {{120, 0}, {8, 8}, {0, 0}, {0, 16}, {0, 16}, {-8, 8}, {-8, 0}, {-8, 8}, {-16, 0}, {0, -16}, {-40, 8}, {-8, -8}}; 
    kml_ffth_complex *in; 
    in = (kml_ffth_complex*)kml_ffth_malloc(sizeof(kml_ffth_complex) * n0 * (n1 / 2 + 1)); 
    for (int i = 0; i < n0 * (n1 / 2 + 1); i++){ 
        in[i][0] = init[i][0]; 
        in[i][1] = init[i][1]; 
    } 
    float *out; 
    out = (float*)kml_ffth_malloc(sizeof(float) * n0 * n1); 
    kml_ffth_plan plan; 
    plan = kml_ffth_plan_dft_scale_c2r_2d(n0, n1, in , out , KML_FFT_ESTIMATE);  
    kml_ffth_execute_dft_scale_c2r(plan, in, out); 
 
    kml_ffth_destroy_plan(plan); 
    kml_ffth_free(in); 
    kml_ffth_free(out); 
 
    /* 
     * out = {0.000000e+00, 6.400000e+01, 1.600000e+02, 2.240000e+02, 
     *        1.120000e+02, 1.600000e+01, 8.000000e+01, 1.760000e+02, 
     *        1.920000e+02, 1.280000e+02, 3.200000e+01, 9.600000e+01, 
     *        2.400000e+02, 2.080000e+02, 1.440000e+02, 4.800000e+01} 
     */

Parent topic: C2R Transforms