Why do some functions like fread, find, sum (etc) not show up in Profiler?

I recently started to use Profiler with the hopes of using it to find performance bottlenecks, etc. Much to my surprise the number of functions and operations that actually show up in Profiler are actually quite small compared to the number I'm actually using in my code. Those listed in the subject line are just a few examples. Can anyone explain why these wouldn't show up in Profiler? Or am I just using it incorrectly?

I started Profiler with:

profile on -history

and started the viewer with:

profile viewer

I also tried looking at the results returned in:

p = profile('info');

But this wasn't any better than what was shown in the viewer.

Please help!

Answer 1

[Jan]

Perhaps the undocumented detail level helps:

profile('on', '-detail', 'builtin')

See also http://undocumentedmatlab.com/blog/undocumented-profiler-options/

[Robert]

Yes! This is what I needed! Thank you very much.

I guess my next question (to Mathworks) would be: Why is this not documented?!?

[Jan]

@Robert: TMW usually does not document why a feature is not documented. But the general rul is that all documented features are supported and kept for forward compatibility as far as possible (but unfortuantely not to 100%). So if a feature is under construction (like uitree and uitabgroup, the new HG2 style etc.) the documentation is not made public.

[Robert]

Is this a new feature???

Answer 2

[Vishal Rane]

I checked what u said in R2013a.

The profile report has the following note at the start :

Note that built-in functions do not appear in this report

[Robert]

I'm not seeing that note. In any case, it wouldn't make any sense because the profiler is showing plenty of other built-in functions (mean, num2str, var, int2str, etc.).

[Walter Roberson]

Those other functions are not built-in. For example,

>> which num2str
/Applications/MATLAB_R2013a.app/toolbox/matlab/strfun/num2str.m
>> which fread
built-in (/Applications/MATLAB_R2013a.app/toolbox/matlab/iofun/fread)

[Vishal Rane]

From MATLAB Help: A built-in function is part of the MATLAB executable. MATLAB does not implement these functions in the MATLAB language. Although most built-in functions have a .m file associated with them, this file only supplies documentation for the function.

[Robert]

That is helpful, thank you! But I still don't see that note in the Profiler. This seems to be a major drawback of Profiler, if it does not include built-in functions in its report.