How to vectorize For loop and array with indexing

1 次查看（过去 30 天）
shahrizan jamaludin
评论： shahrizan jamaludin 2016-3-11
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

请先登录，再回答此问题。

回答（1 个）

Matthew Eicholtz
Matthew Eicholtz 2016-3-8
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 个评论
显示 1更早的评论
Matthew Eicholtz
Matthew Eicholtz 2016-3-10
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 2016-3-11
I managed to vectorize this code with arrayfun. but the time differen is not that much

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Structures 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by