Accessing code for built-in functions

Hi,

I cannot use the open or edit commands to see the source code for built-in functions. When I do it I can only see the comments that are included for that function but not the actual code.

I'm trying this on functions like plot.m and fft.m

I hope somenone can give me advice.

Best,

Taygun

[Steven Lord]

What were you hoping to do with the source code for those built-in functions? If you were hoping to convert them to another language (specifically C or C++) some of them are supported by MATLAB Coder. fft is supported by MATLAB Coder, plot is not.

Answer 1

[Max Heimann]

These functions are not accessible to users as they are MATLABs proprietary code. They are p-coded, which its matlabs way to obscure code. You can only see the header of p-coded files.

You may still place breakpoints and see what they do with the workspace, but you will not be able to see the source code.

[Walter Roberson]

more correctly, a lot of them are built-in functions coded in C or C++ with occasional Fortran as well.

[Fikret Taygun Duvan]

Thanks for the answer Max.

Answer 2

[Gerardo]

did you try with dbtype?

then you just have to copy it on notepad++ and with select column delete the colum number to work on it

For example

% dbtype ode113
% Returns 670 lines as such

1 function varargout = ode113(ode,tspan,y0,options,varargin)

2 %ODE113 Solve non-stiff differential equations, variable order method.

3 % [TOUT,YOUT] = ODE113(ODEFUN,TSPAN,Y0) with TSPAN = [T0 TFINAL] integrates

4 % the system of differential equations y' = f(t,y) from time T0 to TFINAL

5 % with initial conditions Y0. ODEFUN is a function handle. For a scalar T

6 % and a vector Y, ODEFUN(T,Y) must return a column vector corresponding

7 % to f(t,y). Each row in the solution array YOUT corresponds to a time

8 % returned in the column vector TOUT. To obtain solutions at specific

9 % times T0,T1,...,TFINAL (all increasing or all decreasing), use TSPAN =

10 % [T0 T1 ... TFINAL].

11 %

[Steven Lord]

ode113 is a MATLAB function file that is included as part of MATLAB. But I wouldn't call it a built-in function in the same way that something like plot or fft are.

which ode113

/MATLAB/toolbox/matlab/funfun/ode113.m

which plot

built-in (/MATLAB/toolbox/matlab/graphics/graphics/graph2d/plot)

which fft

built-in (/MATLAB/toolbox/matlab/datafun/fft)