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How to optimize this code by avoiding nested for loops?

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Canberk Suat Gurel
Canberk Suat Gurel 2018-4-12
回答： Walter Roberson 2018-4-12
Hi all,
I have written the following code, whose Elapsed time is 32.427771 seconds.
t=1;
ObsX=[]; ObsY=[];
tic
for i = 3.53:0.0001:4.67
for j = -6.17:0.0001:-4.53
ObsX(t) = j;
ObsY(t) = i;
t=t+1;
end
end
toc
I have rectangular obstacle with the coordinates 3.53:4.67 and -6.17:-4.53 and the resolution is 0.0001. I am trying to store the X coordinates in array ObsX and Y coordinates in array ObsY.
Can you suggest way to improve the computation time? Thanks!

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Walter Roberson
Walter Roberson 2018-4-12
[X, Y] = ndgrid(3.53:0.0001:4.67, -6.17:0.0001:-4.53);
ObsX = X(:);
ObsY = Y(:);
Note: I did not check to be sure that the values are in the same order as you created. You might need meshgrid() instead of ndgrid()

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