Azzera filtri
Azzera filtri

How to vectorize For loop and array with indexing

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Hello, i want to vectorize the linecirc function below:
xout = zeros(nAngles,2); %360x2 size
yout = zeros(nAngles,2); %360x2 size
for i = 1:nAngles
[xout(i,:),yout(i,:)] = linecirc(slope(i),intercept(i),xp,yp,rp); %slope=intercept=1x360 size
end
before this, i tried to use arrayfun. unfortunately arrayfun is not faster than for loop. maybe indexing can make it faster. Thanks
  2 Commenti
shahrizan jamaludin
shahrizan jamaludin il 8 Mar 2016
linecirc is a matlab function which to find intersections of circles and lines in Cartesian plane

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Risposte (1)

Matthew Eicholtz
Matthew Eicholtz il 8 Mar 2016
Disclaimer: I do not have R2016a, so I cannot test the linecirc function.
But, if you already tried arrayfun and it was slower, I think the for-loop is going to be your fastest bet. Is there a reason (other than speed) that you want to vectorize the code? Sometimes a for-loop is the way to go.
  3 Commenti
Matthew Eicholtz
Matthew Eicholtz il 10 Mar 2016
Ah, I thought linecirc was exclusive to R2016a, but I see now that it is in earlier versions. However, it requires the Mapping Toolbox, which I do not have, so I still cannot test it.
Vectorization is not always the best route if you do not need it. Hence my question about your motives.
shahrizan jamaludin
shahrizan jamaludin il 11 Mar 2016
I managed to vectorize this code with arrayfun. but the time differen is not that much

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