Why the function "timeit" doesn't work correctly
显示 更早的评论
Help_please
I have a problem in function timeit (also tic toc) in matlab R2016a , it dsesn't calculate the correct time , for exemple: the result supposed to be: 4,.... seconds but it gives always 0,3....(the same code give a correct answer but in Matlab 2014)
1 个评论
Jan
2022-8-7
What is your question? It is not clear, why you expect a specific runtime. Without any details it is impossible to answer.
采纳的回答
Jan
2022-8-7
1 个投票
timeit and tic/toc measure the runtime. If they determine a runtime of 4 seconds in Matlab R2014 and just 0.3 seconds in Matlab R2016a, this means, that Matlab works faster for the concerned results.
Remember, that the new graphics engine HG2 was introduced in R2014b. Maybe tic/toc measures the time before a complicated figure is rendered. So insert a drawnow in your code.
As said alread: As long as you do not mention any details about the code, it is impossible to understand, why you assume a problem. Post some code, which reproduces the problem and a more explicit explanation is possible.
3 个评论
Sihem
2022-8-7
Walter Roberson
2022-8-8
编辑：Walter Roberson
2022-8-8
timeit() will usually run the function multiple times, in order to reduce measurement noise. (If the initial run takes more than a particular hard-coded amount of time then timeit() will just report that time rather than running several invocations.)
The design of the original timeit is discussed at https://blogs.mathworks.com/steve/2008/02/29/timing-code-in-matlab/
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Startup and Shutdown 的更多信息
Translated by 
