How can I create a matrix of size nxn (user input) where all outside numbers are 1, incrementally decreasing by 1 each layer the matrix goes in?

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Makaio
Makaio 2023-3-30
回答： Stephen23 2023-3-30
I am trying to write a code that creates something like this for a 5x5 matrix:
1 1 1 1 1
1 2 2 2 1
1 2 3 2 1
1 2 2 2 1
1 1 1 1 1
I currently have this:
rows = input('Input the amount of rows: ');
cols = input('Input the amount of columns: ');
A = [];
for r = 1:rows
for c = 1:cols
for n = 1: rows
if r == n || r == rows-n+1 || c == n || c == cols-n+1
A(r,c) = n;
fprintf('%d ', A(r,c))
end
end
end
fprintf('\n')
end

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采纳的回答

Cameron
Cameron 2023-3-30
Ran in:
n = 5;
mymat = zeros(n);
endVal = n;
startVal = 1;
for a = 1:ceil(n/2)
indx = startVal:endVal;
mymat(indx,indx) = a;
startVal = startVal + 1;
endVal = endVal - 1;
end
disp(mymat)
1 1 1 1 1 1 2 2 2 1 1 2 3 2 1 1 2 2 2 1 1 1 1 1 1

更多回答（1 个）

Stephen23
Stephen23 2023-3-30
Ran in:
N = 5;
V = min(1:N,N:-1:1);
M = min(V,V.')
M = 5×5
1 1 1 1 1 1 2 2 2 1 1 2 3 2 1 1 2 2 2 1 1 1 1 1 1

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