MATLAB: Sparsfun built-in function

built-infunctionMATLABsparsfun

I have a code that uses the sparsfun function, but when I run the code I get the following error:

Error using sparsfun
Unknown command option.

I try to get help on that function, but it does not exist and when I use the which function I get:

which('sparsfun')
built-in (undocumented)  % char method

Does anyone know about this function?

Best Answer

There is not even a single reference to sparsfun in the R2018b code in any .m in any of the toolboxes I have access to (many, but not all.)

It appears it was a routine that was used in the past to implement some of the sparse matrix operations.

There are a couple of commands documented for it in http://www.netlib.org/linalg/colamd/colamd_demo.m

The brief description from https://hwiegman.home.xs4all.nl/matlab4/sparsfun_m.htm also references nnz

You can find further hints at http://mseas.mit.edu/download/phaley/Matlab/Profile/Example/file50.html

It looks like matlab.internal.math.getOrSetSPPARMS() has replaced at least some of the uses.

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MATLAB: What are built-in functions

From the doc:

Functions that are frequently used or that can take more time to execute are often implemented as executable files. These functions are called built-ins.

Unlike MATLAB program file functions, you cannot see the source code for built-ins. Although most built-in functions do have a program file associated with them, this file is there mainly to supply the help documentation for the function.

http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_prog/br65lhj-1.html#br65lhj-6

MATLAB: List of built-in functions

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.

Best Answer

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MATLAB: List of built-in functions

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