What is a child function?

2016 6 24
1 个回答
回答已采纳
更新时间：2016 6 24
6 次查看（30 天）

0 个投票

When I 'Run and time' a function, and look at the bottom of the profile summary, it says "Self time is the time spent in a function excluding the time spent in its child functions. Self time also includes overhead resulting from the process of profiling. I can have a vague idea as to what it is based on context (i.e. subfunctions), but would like a more rigorous definition of what it is.

请先登录，再回答此问题。

 采纳的回答

Walter Roberson
Walter Roberson 2016-6-24

0 个投票

Child functions in this context is any routine that is called. For example,
function test
for K = 1 : 300000
sort(rand(1,K));
end
then "self-time" would be the total time spent executing test minus the time spent executing rand and sort

2 个评论
显示 无 隐藏 无

Naveen
Naveen 2016-6-24
So for example, the following code, when 'run and timed'
A = zeros(length(C) - end_info,n_mnr);
for i =start_row:length(C)
A(i - end_info,:) = str2num(C{i});
end
produces this as one of the lines in the profile summary.
Function Name .......Calls ...... Total Time .......Self Time*
str2num............1048578 ....... 95.887s ........... 22.986s
What would be the child functions for str2num then? Does it refer to functions within the pre-programmed str2num?
Walter Roberson
Walter Roberson 2016-6-24
Yes, str2num() calls several functions, with the major work being done by eval(), which is relatively inefficient.
Note: if you are concerned about performance you should look at str2double() or sscanf()

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Data Type Conversion 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