如何在 MATLAB 中对二维数组执行插值 [英] How to perform interpolation on a 2D array in MATLAB

问题描述

如何制作一个包含 2 个变量的函数并给定一个二维数组，它会返回一个内插值?

How can I make a function of 2 variables and given a 2D array, it would return an interpolated value?

我有 N x M 数组 A.我需要对它进行插值并以某种方式获得该表面的函数，以便我可以选择非整数参数的值.(我需要将该插值用作 2 个变量的函数)

I have N x M array A. I need to interpolate it and somehow obtain the function of that surface so I could pick values on not-integer arguments. (I need to use that interpolation as a function of 2 variables)

例如:

A[N,M] //my array
// here is the method I'm looking for. Returns function interpolatedA
interpolatedA(3.14,344.1) //That function returns interpolated value

推荐答案

对于常规网格上的数据，请使用 interp2.如果您的数据分散，请使用 griddata.您可以创建一个 匿名函数 作为这些函数的简化包装器电话.

For data on a regular grid, use interp2. If your data is scattered, use griddata. You can create an anonymous function as a simplified wrapper around those calls.

M = 10;
N = 5;
A = rand(M,N);
interpolatedA = @(y,x) interp2(1:N,1:M,A,x,y);
%interpolatedA = @(y,x) griddata(1:N,1:M,A,x,y); % alternative
interpolatedA(3.3,8.2)

ans =
      0.53955

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