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鲲鹏小智

kml_fft(f)_plan_dft_1d

建立单个连续数据序列1维C2C变换的plan。

接口定义

C interface:

kml_fft_plan kml_fft_plan_dft_1d(int n, kml_fft_complex *in, kml_fft_complex *out, int sign, unsigned flags);

kml_fftf_plan kml_fftf_plan_dft_1d(int n, kml_fftf_complex *in, kml_fftf_complex *out, int sign, unsigned flags);

Fortran interface:

RES = KML_FFT_PLAN_DFT_1D(N, IN, OUT, SIGN, FLAGS);

RES = KML_FFTF_PLAN_DFT_1D(N, IN, OUT, SIGN, FLAGS);

返回值

函数返回一个kml_fft(f)_plan类型的结构体指针。将该对象作为参数传入kml_fft(f)_execute函数中使用,将对当前提供的输入in和输出out执行FFT变换;另外,也可以通过将该对象作为参数传入kml_fft(f)_execute_dft函数中以对新的输入in和输出out执行FFT变换。

如果函数返回非空指针,则表示plan执行成功,否则表示执行失败。

参数

参数名

数据类型

描述

输入/输出

n

int

输入FFT序列的大小,约束:n≥1。

输入

in

  • 双精度:kml_fft_complex*
  • 单精度:kml_fftf_complex*

输入待变换的数据。

输入

out

  • 双精度:kml_fft_complex*
  • 单精度:kml_fftf_complex*

输出快速傅里叶变换后的数据。

输出

sign

int

描述正向变换或反向变换。

  • -1(KML_FFT_FORWARD):forward
  • +1(KML_FFT_BACKWARD):backward

输入

flags

unsigned int

planning选项,未使用。

输入

依赖

C: "kfft.h"

示例

C interface:

    int N = 16; 
    kml_fft_complex *in; 
    kml_fft_complex *out; 
    kml_fft_plan plan; 
    in = (kml_fft_complex*)kml_fft_malloc(sizeof(kml_fft_complex) * N); 
    out = (kml_fft_complex*)kml_fft_malloc(sizeof(kml_fft_complex) * N); 
    for (int i = 0; i < N; i++){ 
        in[i][0] = (double)i; 
        in[i][1] = (double)i; 
    } 
    plan = kml_fft_plan_dft_1d(N, in , out, KML_FFT_FORWARD, KML_FFT_ESTIMATE); 
    kml_fft_execute_dft(plan, in, out); 
 
    kml_fft_destroy_plan(plan); 
    kml_fft_free(in); 
    kml_fft_free(out); 
 
    /* 
     * out = {{1.200000e+02, 1.200000e+02}, {-4.821872e+01, 3.221872e+01}, 
     *        {-2.731371e+01, 1.131371e+01}, {-1.997285e+01, 3.972846e+00}, 
     *        {-1.600000e+01, 0.000000e+00}, {-1.334543e+01, -2.654571e+00}, 
     *        {-1.131371e+01, -4.686292e+00}, {-9.591299e+00, -6.408701e+00}, 
     *        {-8.000000e+00, -8.000000e+00}, {-6.408701e+00, -9.591299e+00}, 
     *        {-4.686292e+00, -1.131371e+01}, {-2.654571e+00, -1.334543e+01}, 
     *        {0.000000e+00, -1.600000e+01}, {3.972846e+00, -1.997285e+01}, 
     *        {1.131371e+01, -2.731371e+01}, {3.221872e+01, -4.821872e+01}} 
     */

Fortran interface:

    INTEGER(C_INT) :: N = 16 
    TYPE(KML_FFT_COMPLEX), POINTER :: IN, OUT 
    TYPE(C_PTR) :: PIN, POUT 
    TYPE(C_PTR) :: PLAN 
    INTEGER(C_SIZE_T) :: SIZE 
    SIZE = 16 * N 
    PIN = KML_FFT_MALLOC(SIZE) 
    POUT = KML_FFT_MALLOC(SIZE) 
    CALL C_F_POINTER(PIN, IN, SHAPE=[N]) 
    CALL C_F_POINTER(POUT, OUT, SHAPE=[N]) 
    INTEGER :: I 
    DO WHILE(I <= N) 
        IN%R = I 
        IN%I = I 
    END DO 
    PLAN = KML_FFT_PLAN_DFT_1D(N, IN , OUT, KML_FFT_FORWARD, KML_FFT_ESTIMATE) 
    CALL KML_FFT_EXECUTE_DFT(PLAN, IN, OUT) 
 
    CALL KML_FFT_DESTROY_PLAN(PLAN) 
    CALL KML_FFT_FREE(PIN) 
    CALL KML_FFT_FREE(POUT) 
 
    ! 
    ! OUT = \1.200000E+02, 1.200000E+0, -4.821872E+01, 3.221872E+01, 
    !        -2.731371E+01, 1.131371E+01, -1.997285E+01, 3.972846E+00, 
    !        -1.600000E+01, 0.000000E+00, -1.334543E+01, -2.654571E+00, 
    !        -1.131371E+01, -4.686292E+00, -9.591299E+00, -6.408701E+00, 
    !        -8.000000E+00, -8.000000E+00, -6.408701E+00, -9.591299E+00, 
    !        -4.686292E+00, -1.131371E+01, -2.654571E+00, -1.334543E+01, 
    !        0.000000E+00, -1.600000E+01, 3.972846E+00, -1.997285E+01, 
    !        1.131371E+01, -2.731371E+01, 3.221872E+01, -4.821872E+01/ 
    !
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