---
title: kml_ffth_plan_dft_scale_1d
description: "建立单个连续数据序列1维C2C变换的plan。"
url: https://www.hikunpeng.com/document/detail/zh/hpchistory/hpckit/develop2400/kunpengaccel_kml_1042.html
sourcePath: /source/zh/hpchistory/hpckit/develop2400/kunpengaccel_kml_1042.html
indexId: 2726119dbf2c291c8e519021e50fb6431c81d7299c145fc8211e5007740b783367
---
# kml_ffth_plan_dft_scale_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_ffth_plan kml_ffth_plan_dft_scale_1d(int n, kml_ffth_complex *in, kml_ffth_float_complex *out, int sign, unsigned flags);


#### 返回值

函数返回一个kml_ffth_plan类型的结构体指针。将该对象作为参数传入kml_fft(f/h)_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_ffth_plan_dft_scale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 | kml\_ffth\_complex\* | 输入待变换的数据。 | 输入 |
| out | kml\_ffth\_float\_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_ffth_complex *in;
kml_ffth_complex *out;
kml_ffth_plan plan;
in = (kml_ffth_complex*)kml_ffth_malloc(sizeof(kml_ffth_complex) * N);
out = (kml_ffth_float_complex*)kml_ffth_malloc(sizeof(kml_ffth_float_complex) * N);
for (int i = 0; i < N; i++){
in[i][0] = (__fp16)i;
in[i][1] = (__fp16)i;
}
plan = kml_ffth_plan_dft_scale_1d(N, in , out, KML_FFT_FORWARD, KML_FFT_ESTIMATE);
kml_ffth_execute_dft_scale(plan, in, out);
kml_ffth_destroy_plan(plan);
kml_ffth_free(in);
kml_ffth_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}}
*/
```