How to generate a matrix with desired pattern using nested for loops?

Question

Alfredo Scigliani 2022-5-14

0
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https://ww2.mathworks.cn/matlabcentral/answers/1718975-how-to-generate-a-matrix-with-desired-pattern-using-nested-for-loops

编辑： Dyuman Joshi 2022-5-14

I need to generate a 5x5 matrix like this one using nested for loops.

My first thought is to generate a zeros or ones matrix of same size and perform an operation to each term making it change to the desired one. I guess it is more complicated than I thought. Here is how I am trying to do it.

clear; clc;

A = zeros(5,5);

[numRows, numCols] = size(A);

for i = 1:numRows

for j = 1:numCols

A(i,j) = 1; %in here I would perform an operation or something that will make the specific number change.

end

A

% another thing that comes to my mind is to change the step from 1:numRows and 1:numCols to something like 1:2:numRows etc but it didn't work as expected.

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Answer 1

Dyuman Joshi 2022-5-14

1
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https://ww2.mathworks.cn/matlabcentral/answers/1718975-how-to-generate-a-matrix-with-desired-pattern-using-nested-for-loops#answer_963740

编辑：Dyuman Joshi 2022-5-14

在 MATLAB Online 中打开

n=5;
A=zeros(n);
for i = 1:n
    for j = min(i,n-i+1):max(i,n-i+1)
        A(i,j) = 1;
    end
end
A
A = 5×5
     1     1     1     1     1
     0     1     1     1     0
     0     0     1     0     0
     0     1     1     1     0
     1     1     1     1     1