如何从二维数组中获取数据并放入一维数组中 [英] How to get data from 2D array and put into 1D array

问题描述

我有一个2D数组，我想通过MATLAB创建一个1D，满足1D输出的每个元素是由2D数组中给定索引的值创建的要求。示例2D数组是

I have a 2D array and I want to create a 1D by MATLAB, satisfying the requirement that each element of the 1D output was created by the value of a given index into the 2D array. Example 2D array is

A=[2 4 6; 1 9 7.3 4 5]

1D阵列的索引

X=[1;2;3]
Y=[1;2;3]

我想存储1D数组，其元素由

I want to store the 1D array with elements determined by

 B=A(x,y) % x,y are index in X and Y matrix

示例构建一维数组：

X=[1;2;3]
Y=[1;2;3]

 B=[A(1,1);A(2,2);A(3,3)]=[2; 9; 5]

这是我的代码

B=zeros(1,length(A));
B=A(...)  %I don't know it

怎么能我实现了吗？
全部谢谢。

How can I implement it? Thanks all.

推荐答案

您正在寻找 sub2ind ：

You are looking for sub2ind:

A=[2 4 6; 1 9 7; 3 4 5]
X=[1;2;3]; Y=[1;2;3];
B = A(sub2ind(size(A),X,Y))

B =

     2
     9
     5

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