kml_float_spline2d_eval_deriv_y

这个函数返回插值函数对于给定点(x, y)的偏导。计算中使用插值对象interp，数据数组xarr，yarr和zarr以及加速器xacc和yacc。对于x在xarr的区间外或y在yarr的区间外，将返回报错信息。

接口定义

float kml_float_spline2d_eval_deriv_y(const kml_float_spline2d *interp, const float x, const float y, kml_interp_accel *xa, kml_interp_accel *ya)

int kml_float_spline2d_eval_deriv_y_e(const kml_float_spline2d *interp, const float x, const float y, kml_interp_accel *xa, kml_interp_accel *ya, float *z)

参数

参数名	类型	描述	输入/输出
interp	kml_float_spline2d *	插值对象指针	输入
x	float	求解点x的值	输入
y	float	求解点y的值	输入
xa	kml_interp_accel *	加速器对象指针	输入
ya	kml_interp_accel *	加速器对象指针	输入
z	float *	插值点偏导值∂z/∂y计算结果	输出

依赖

#include "kml_spline2d.h"

示例

const size_t xMin = 4;
const size_t xMax = 2048;
const size_t xSize = 4;
const size_t yMin = 4;
const size_t yMax = 2048;
const size_t ySize = 4;
const float xValLo = 1;
const float xValHi = 2;
const float yValLo = 1;
const float yValHi = 2;
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_spline2d *spline = kml_float_spline2d_alloc(kml_float_interp2d_bicubic, xSize, ySize);
kml_interp_accel *xacc = kml_interp_accel_alloc();
kml_interp_accel *yacc = kml_interp_accel_alloc();
kml_float_spline2d_init(spline, xArr, yArr, zArr, xSize, ySize);
z = kml_float_spline2d_eval_deriv_y(spline, xArr, yArr, zArr, x, y, xacc, yacc);

父主题： spline2d