How to use matlab griddata function

The griddata function is used to interpolate the corresponding Z value at a given (X, Y) coordinate, thereby gridding a set of three-dimensional data (x, y, z). Its usage is "griddata(x, y, z, xi, yi, method)".

The griddata function is used to interpolate the corresponding Z value on the given (X,Y) coordinates, thereby converting a set of three-dimensional data (x ,y,z) gridding. Its usage is as follows:

griddata(x, y, z, xi, yi, method)

Parameter description:

x: x coordinate of the original data point, which is a vector.

y: The y coordinate of the original data point, which is also a vector with the same length as x.

z: The value of the original data point, which is also a vector with the same length as x.

xi: x coordinate of the interpolation point, which can be a vector or matrix.

yi: The y coordinate of the interpolation point, which can be a vector or matrix, must be the same size as xi.

method: Interpolation method, optional parameters, including 'linear' (linear interpolation), 'cubic' (cubic spline interpolation), 'nearest' (nearest neighbor interpolation).

Return value:

zi: The interpolation result of the interpolation point, which is the same size as xi and yi.

Sample code:

% 生成一些随机数据
x = rand(100, 1);
y = rand(100, 1);
z = sin(2pix).cos(2pi*y);
% 定义插值点的网格
[XI, YI] = meshgrid(0:0.1:1);
% 使用线性插值方法进行插值
ZI = griddata(x, y, z, XI, YI, 'linear');
% 绘制原始数据点和插值结果
scatter3(x, y, z, 'filled'); hold on; surf(XI, YI, ZI);

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