kml_ffth_plan_dft_scale_c2r_1d

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

Interface Definition

C interface:

kml_ffth_plan kml_ffth_plan_dft_scale_c2r_1d(int n, 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
n	int	Inputs the FFT array size. The constraint is n ≥ 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; 
    __fp16 init[3][2] = {{120, 0}, {8, 8}, {0, 0}}; 
    kml_ffth_complex *in; 
    in = (kml_ffth_complex*)kml_ffth_malloc(sizeof(kml_ffth_complex) * (n0 / 2 + 1)); 
    for (int i = 0; i < (n0 / 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); 
    kml_ffth_plan plan; 
    plan = kml_ffth_plan_dft_scale_c2r_1d(n0, 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 = {1.360000e+02, 1.040000e+02, 1.040000e+02, 1.360000e+02} 
     */

Parent topic: C2R Transforms