Creating a diagonal matrix

Question

0 个投票

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
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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.

Answer 1

KSSV 2017-8-1

0 个投票

A1(3:end,:) = []

Answer 2

Andrei Bobrov 2017-8-5

0 个投票

t = true(2,4);
out = tril(t,2) & triu(t);