How to increase the speed of this code?

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Zhongruo Wang
Zhongruo Wang 2016-4-8
评论： Roger Stafford 2016-4-9
Here, I want to generate a 3D lattice points in the form of 3 column tuples. Here is my code:
% code
pts = [];
for i = 0.01:0.01:1
for j = 0.01:0.01:1
for k = 0.01:0.01:1
a = [i j k];
pts = [pts;a];
end
end
end
end
It is too slow when I run this script in the Matlab, is there any way to increase the speed of the operation? Or is there any way to decrease the number of the for loop?
Thanks

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采纳的回答

Roger Stafford
Roger Stafford 2016-4-8
编辑：Roger Stafford 2016-4-8
Try 'ndgrid':
[X,Y,Z] = ndgrid(0.01:0.01:1);
pts = [Z(:),Y(:),X(:)]; %(Corrected)

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2016-4-8
i = 0.01:0.01:0.1
j = 0.01:0.01:.1
k = 0.01:0.01:.1
[ii,jj,kk]=meshgrid(i,j,k)
out=[kk(:) ii(:) jj(:)]

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