MATLAB Answers

List of built-in functions?

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Is there somewhere a list of Matlab’s built-in functions like histc that are not written in Matlab own scripting language? That is, functions whose code that can’t be revealed by open functionName.

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Asvin Kumar
Asvin Kumar 8 Apr 2020
Can you provide more details as to what your use case is?
Fredrik P
Fredrik P 20 Jun 2020
Asvin: Sorry for my superslow reply. I found histc by asking on Stack Exchange and could make my code run much faster. I guess that I was looking for a list of similarly fast functions that I could browse to see if I could find any obvious candidates to up the speed further. (I realize that this is probably best done by profiling and zooming in bottlenecks, but I still feel that a list could be useful.)
per isakson
per isakson 20 Jun 2020
At Undocumented Matlab you will find interesting articles on performance.

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per isakson
per isakson 21 Jun 2020
편집: per isakson 21 Jun 2020
On R2018b, Win10 and a SSD, this code
%%
tic
sad = dir( fullfile( matlabroot, 'toolbox', 'matlab', '**', '*.m' ) );
%%
for d = reshape( sad, 1,[] )
if d.bytes <= 4096
ffs = fullfile( d.folder, d.name );
chr = fileread( ffs );
if contains( chr, 'Built-in function', 'IgnoreCase',true )
fprintf( '%s\n', d.name );
end
end
end
toc
produced a list with 496 names. The elapse time of the second run was less than two and a half seconds.

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Walter Roberson
Walter Roberson 21 Jun 2020
There are also additional built-in functions that do not have documenting .m files

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추가 답변(1개)

Joost
Joost 20 Jun 2020
There is an interesting book on speeding up Matlab functions and scripts. A few years old already, but a good read. Author Yair Altman, also active on Matlab Answers and mastermind behind the Undocumented Matlab page mentioned in one of the comments.

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