清空筛选条件
清空筛选条件

Does tilda in a function output give any speed up?

1 次查看（过去 30 天）
Anton
Anton 2016-3-12
回答： Kuba 2016-7-25
If, say, I use
[a,b,~]=svd(d);
instead of
[a,b,c]=svd(d);
should I generally expect any speed up and/or memory saving? Or it depends on the function I use and should be tested each time?

请先登录，再回答此问题。

回答（3 个）

Star Strider
Star Strider 2016-3-12
Time it and find out!
I doubt it, though. The value is still calculated, but no space is made for it in the calling function workspace.
Jan
Jan 2016-3-12
From inside the function there is no way to check, if the 3rd agrument is caught in the caller or not. Therefor the runtime for the function must be the same. But the calling function can free the memory for the argument immediately. For huge arrays this can be an advantage under certain circumstances, but not in general.
Kuba
Kuba 2016-7-25
And what about using tilda in input arguments, say:
[a,b,c]=svd(~, e);
Instead of:
[a,b,c]=svd(d, e);
Is there any difference in performance?

类别

在 Help Center 和 File Exchange 中查找有关 Whos 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