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Creating a diagonal matrix

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Gratitude Kim
Gratitude Kim 2017-8-5
编辑： Andrei Bobrov 2017-8-6
I will like to create such diagonal matrix. A=[1 1 1 0 0 0; 0 1 1 1 0 0; 0 0 1 1 1 0; 0 0 0 1 1 1] Appreciate your kind assitance.

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回答（4 个）

Matt J
Matt J 2017-8-5
A=conv2(eye(4),[1,1,1])
John D'Errico
John D'Errico 2017-8-5
编辑：John D'Errico 2017-8-5
That is not a diagonal matrix, not by the common definition of the term. It has non-zero diagonals, but that is as far as I might go.
Still trivial though.
triu(tril(ones(4,6),2))
ans =
1 1 1 0 0 0
0 1 1 1 0 0
0 0 1 1 1 0
0 0 0 1 1 1
Or...
toeplitz([1 0 0 0]',[1 1 1 0 0 0])
ans =
1 1 1 0 0 0
0 1 1 1 0 0
0 0 1 1 1 0
0 0 0 1 1 1
Andrei Bobrov
Andrei Bobrov 2017-8-5
编辑：Andrei Bobrov 2017-8-6
full(spdiags(ones(4,3),0:2,4,6))
or
t = true(4,6);
out = tril(t,2) & triu(t)
or
a = triu(ones(4,3));
out = [a,rot90(a,2)]
Matt J
Matt J 2017-8-5
编辑：Matt J 2017-8-5
You could also use interpMatrix ( Download ) in a somewhat weird way,
A=full( interpMatrix( [1,1,1] , 1,4,1,'allcontrib') )

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