How to create triangle inside matrix?

2016 8 30
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更新时间：2016 9 10
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What if I wanted a triangle of numbers from the formula (2n-1) that resulted in a triangle inside a matrix such that...
[0 0 0 0 1 0 0 0 0]
0 0 0 2 1 2 0 0 0
0 0 3 2 1 2 3 0 0
0 4 3 2 1 2 3 4 0]
etc?...

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Andrei Bobrov
Andrei Bobrov 2016-8-30

3 个投票

sort(spdiags(toeplitz(1:n)))

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Billy Albritton
Billy Albritton 2016-8-30
Stop being a genius. :-)
Billy Albritton
Billy Albritton 2016-8-30
What if I want to write a loop script to do the same thing?
Andrei Bobrov
Andrei Bobrov 2016-8-30
编辑：Andrei Bobrov 2016-8-30
Hi Billy!
With loop:
a = zeros(n,2*n-1);
for jj = 1:n
a(jj,n-jj+1:n+jj-1) = [jj:-1:1,2:jj];
end
Billy Albritton
Billy Albritton 2016-9-10
Thank you! You are amazing!

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