How to get back the original matrix with indices of matrix?

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Ammy
Ammy 2021-8-21
评论： Awais Saeed 2021-8-21
Let
A=reshape (1:16 ,4,4);
B1 = A(1:2:end, 1:2:end);
B2 = A(1:2:end, 2:2:end);
B3= A(2:2:end, 1:2:end);
B4 = A(2:2:end, 2:2:end);
How can I get back A with B1, B2,B3, and B4

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Awais Saeed
Awais Saeed 2021-8-21
clc;clear all;close all
A=reshape (1:16 ,4,4); % 4x4 matrix
B1 = A(1:2:end, 1:2:end);
B2 = A(1:2:end, 2:2:end);
B3= A(2:2:end, 1:2:end);
B4 = A(2:2:end, 2:2:end);
c = reshape([B1 B2 B3 B4].', 4,4)';
c(:,[2,3]) = c(:,[3,2]) % swap columns

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