---
title: kml_?_spline_min_size
description: "返回插值对象spline所需要的最小的点的数量。例如，三次插值最小需要3个点。"
url: https://www.hikunpeng.com/document/detail/zh/kunpenghpcs/hpckit/devg/kunpengaccel_kml_0519.html
sourcePath: /source/zh/kunpenghpcs/hpckit/devg/kunpengaccel_kml_0519.html
indexId: a87ab18ee2f1d249e62b1c1c1623c4b64cda81d59345e84686ec65c2294c794a61
---
# kml_?_spline_min_size

返回插值对象spline所需要的最小的点的数量。例如，三次插值最小需要3个点。

#### 接口定义

unsigned int kml_float_spline_min_size(const kml_float_spline *spline)

unsigned int kml_double_spline_min_size(const kml_double_spline *spline);


#### 参数

| 参数名 | 类型 | 描述 | 输入/输出 |
| --- | --- | --- | --- |
| spline | const kml\_float\_spline\* / const kml\_double\_spline\* | 指向插值对象的指针。 | 输入 |


#### 依赖

#include "kipl.h"


#### 示例

```
const size_t xSize = 4;
float xArr[4] = {1,1.33,1.67,2};
float* yArr = (float*)malloc(xSize * sizeof(float));
float x = 1;
float y = 0;
kml_float_spline *spline = kml_float_spline_alloc(kml_float_interp_cspline, xSize);
size_t min_size = kml_float_spline_min_size(spline);
```