Vectorization of double for loop

2015 7 30
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更新时间：2015 7 30
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I am vectorizing following code,doesnt seem to work. I will appreciate any help !
aux=1;
n = sqrt(max(size(u)));
cut = n / Nx;
u = reshape(u, n, n);
for i = 0 : Nx-1
for j = 0 : Nx-1
P{aux}{1} = u(1+ i*cut: (i+1)*cut,1+ j*cut: (j+1)*cut);
aux = aux +1;
end
end

4 个评论
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Jon
Jon 2015-7-30
What do you mean "doesn't seem to work?" Please be specific, and if you can provide an example, it would really help.
ak135AK
ak135AK 2015-7-30
编辑：ak135AK 2015-7-30
this code works, but my implementations of vectorization do not... I am not sure, if it is even possible, is it?
Jon
Jon 2015-7-30
编辑：Jon 2015-7-30
It doesn't seem possible to me, but one of the more experienced users here might be able to make it happen.
ak135AK
ak135AK 2015-7-30
u is vector 1 x n2, then is gets reshaped and is cut into 4 partitions in middle, something like:
% omega 1 | omega 2
% ------------------
% omega 3 | omega 4
and each part is saved into P

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 采纳的回答

Sean de Wolski
Sean de Wolski 2015-7-30

0 个投票

Just preallocating P will speed this up a lot
P = cell(Nx^2,1)
before the loop

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