Creating a diagonal matrix

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Gratitude Kim
Gratitude Kim 2017-8-1
回答： Andrei Bobrov 2017-8-5
Hi, I have written such codes.
Col=4;
Row=3
A1=zeros(Row,Col);
n = size(A1,1);
A1([1:n+1:end,n+1:n+1:end]) = 1
Output:
A1 =
1 1 0 0
0 1 1 0
0 0 1 1
I obtained output A1. Appreciate if you are able to help me to modify the code so it can become [1 1 1 0; 0 1 1 1]. Appreciate your kind assistance.
  1 个评论
Guillaume
Guillaume 2017-8-1
It's unclear what you're asking. Wouldn't
A1 = [1 1 1 0; 0 1 1 1]
answer your question?
Note that your code makes a 3x4 matrix whereas you're now asking for a 2x4 matrix.

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回答（2 个）

KSSV
KSSV 2017-8-1
A1(3:end,:) = []
Andrei Bobrov
Andrei Bobrov 2017-8-5
t = true(2,4);
out = tril(t,2) & triu(t);

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