---
title: kml_float_interp2d_idx
description: "返回网格(i, j)点的index，index的值为j * xsize + i。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengaccel/math-lib/devg-kml/kunpengaccel_kml_0485.html
sourcePath: /source/zh/kunpengaccel/math-lib/devg-kml/kunpengaccel_kml_0485.html
indexId: fe7e64997b78be4d8cf58056fb899c9c7378e6bae8b68892ece546456b76c27468
---
# kml_float_interp2d_idx

返回网格(i, j)点的index，index的值为j * xsize + i。

#### 接口定义

size_t kml_float_interp2d_idx(const kml_float_interp2d *interp, const size_t i, const size_t j)


#### 参数

| 参数名 | 类型 | 描述 | 输入/输出 |
| --- | --- | --- | --- |
| interp | kml\_float\_interp2d\* | 插值对象指针。 | 输入 |
| i | size\_t | x方向的index。 | 输入 |
| j | size\_t | y方向的index。 | 输入 |


#### 依赖

#include "kml_interp2d.h"


#### 示例

```
const size_t xSize = 4;
const size_t ySize = 4;
float xArr[4] = {1,1.33,1.67,2};
float yArr[4] = {1,1.33,1.67,2};
float* zArr = (float*)malloc(xSize * ySize * sizeof(float));
float x = 1;
float y = 1;
float z = 0;
kml_float_interp2d *interp = kml_float_interp2d_alloc(kml_float_interp2d_bicubic, xSize, ySize);
kml_float_interp2d_init(interp, xArr, yArr, zArr, xSize, ySize);
size_t idx = kml_float_interp2d_idx(interp, x, y);
```