Function that returns an NxN matrix

2014 10 8
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更新时间：2014 10 10
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I need to create a function that when a value for N is entered it returns an NxN identity matrix. But this needs to be done without employing Matlab commands which operate on entire matrices, rows, and columns.

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Andrei Bobrov
Andrei Bobrov 2014-10-8
in MATLAB without employing Matlab commands - how?
Stephen23
Stephen23 2014-10-8
All functions require MATLAB commands, starting with the function function.

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Andrei Bobrov
Andrei Bobrov 2014-10-8

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for jj = N:-1:1
out(jj,jj) = 1;
end

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Stephen23
Stephen23 2014-10-8
This uses multiple MATLAB functions: for , colon , end ,...
Andrei Bobrov
Andrei Bobrov 2014-10-8
Hi Stephen! I agree with you.
Michael
Michael 2014-10-9
So I tried this in matlab and no matter what value you enter for N it displays a 4x4 identity matrix.
Stephen23
Stephen23 2014-10-9
编辑：Stephen23 2014-10-9
Andrei Bobrov: I like the array preallocation through the reversed sequence. That is a nice touch!
Andrei Bobrov
Andrei Bobrov 2014-10-10
Hi Stephen! This is idea by Jan Simon.

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