如何在Matlab中矩阵的每对行上应用函数? [英] How to apply a function on every pair of rows of a Matrix in Matlab?

问题描述

我是Matlab的新手，正在研究矩阵，我有点困惑.

I'm new to matlab and working with matrix and I'm kinda confused.

我应该制作一个名为M的m x n矩阵，它的元素是-1，1和0.

I'm supposed to make a m x n matrix called M and it's elements are -1, 1 and 0.

我需要编写一个名为d(x,y)的函数，如果x = -1和y = 1，该函数将返回1.并返回0否则.

I need to write a function called d(x,y) which returns 1 if x = -1 and y = 1. And returns 0 otherwise.

和另一个计算每列中d(m(i，j)，m(k，j))之和的函数:

and another function which calculates the sum of d(m(i,j),m(k,j)) in every column:

请阅读注释中的示例.

如何找到总和?

我知道基本编程，但是我不知道该怎么做.

I know basic programming but I don't know how to do this.

推荐答案

您可以使用nchoosek进行选择:

comb = nchoosek(1:size(m,1), 2);
result = zeros(1, length(comb)); % allocate the memory
% you can run some techniques to run a function on each row of comb
% which is mentinoned in other posts instead of the following code
for i = 1:length(comb)
    result(i) = sum(abs(m(comb(i,1), :) - m(comb(i,2), :)) == 2);
end

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