index of a mnatrix to negative

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Kaushik
Kaushik 2012-12-4
hi,
i have a matrix a =1:10;
so a(1) = 1 and and a(10)=10
is it possible to start indexing from say -3.
so a(-3) = 1, a(-2)=2....a(0)=4,..., and a(6)=10

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回答（2 个）

Matt Fig
Matt Fig 2012-12-4
No. MATLAB has the first index as 1.
Azzi Abdelmalek
Azzi Abdelmalek 2012-12-4
编辑：Azzi Abdelmalek 2012-12-4
You can use positive index to represent negative index.
for example if you have to compute y(k)=sin(k) for k=-3:10
for k=-3:10
idx=k+4; % to make index positive
y(idx)=sin(k)
end

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