如何在MATLAB中将2X2矩阵转换为4X4矩阵? [英] How do I convert a 2X2 matrix to 4X4 matrix in MATLAB?

问题描述

在以以下方式将2X2矩阵转换为4X4矩阵时，我需要一些帮助:

I need some help in converting a 2X2 matrix to a 4X4 matrix in the following manner:

A = [2 6;
     8 4]

应成为:

B = [2 2 6 6;
     2 2 6 6;
     8 8 4 4;
     8 8 4 4]

我该怎么做?

推荐答案

A = [2 6; 8 4];
% arbitrary 2x2 input matrix

B = repmat(A,2,2);
% replicates rows & columns but not in the way you want

B = B([1 3 2 4], :);
% swaps rows 2 and 3

B = B(:, [1 3 2 4]);
% swaps columns 2 and 3, and you're done!

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