我们如何使用nchoosek()获得矩阵行的所有组合? [英] How can we use nchoosek() to get all the combinations of the rows of a matrix?

问题描述

如果我们有1到5个数字的向量v，则可以使用nchoosek(v，2)来获得具有两个元素的所有组合.但是，此函数现在允许我们获取矩阵的所有组合.我想用它来获取矩阵行的所有组合.

If we have a vector v of 1- 5 numbers we can use nchoosek(v,2) to get all the combinations having two elements. But this function does now allow us to get all the combinations of a matrix. I want to use it to get all the combinations of rows of a matrix.

推荐答案

这里是一种方法:

function p = q47204269(inMat)
% Input handling:
if nargin == 0 || isempty(inMat)
  inMat = magic(5);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
rowsCell = num2cell(inMat,2);
nRows = size(inMat,1);
p = cell(nRows,1);
for indR = 1:nRows
  r = nchoosek(1:nRows,indR);
  p{indR} = cell2mat(reshape(rowsCell(r.',:).',indR,1,[]));
end  

另请参阅:

• perms 函数，因为它可能会出现方便您在做什么.
• 此问题.

• The perms function, as it might come in handy in what you're doing.
• This question.

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