speed up max function

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Chaoyang Jiang
Chaoyang Jiang 2018 年 4 月 12 日
コメント済み: Chaoyang Jiang 2018 年 4 月 13 日
How to speed up max function? The following line [a,b] = max(c(1:24,1,2,3)) takes 2685.49s for calling 541390285 times. Is there any way to speed up?
c=randi(100,[24,3,3,3]);
for i=1:1000000
[a,b] = max(c(1:24,1,2,3));
end

採用された回答

dpb
dpb 2018 年 4 月 12 日
A significant fraction is undoubtedly the addressing of the 4D array; the same fragment but
d=c(1:24,1,2,3);
for i=1:1000000
[a,b] = max(d);
end
cut the time by almost 50%. Whether the real application allows that simplification is unknown, but the concept of reducing the data structure overhead is key one.
  1 件のコメント
Chaoyang Jiang
Chaoyang Jiang 2018 年 4 月 13 日
Thank you very much for your reply.

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