List of built-in functions?

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.

[Tommy]

This doesn't directly answer your question, but the function which does tell you whether a function is built-in:

>> which histc
built-in (C:\Program Files\MATLAB\R2019a\toolbox\matlab\datafun\histc)

[dpb]

The list can vary by release...guess one could build a function to parse a listing

[Asvin Kumar]

Can you provide more details as to what your use case is?

[Fredrik P]

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]

At Undocumented Matlab you will find interesting articles on performance.

Answer 1

[per isakson]

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.

[Walter Roberson]

There are also additional built-in functions that do not have documenting .m files

Answer 2

[Joost]

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.

Book