How can I save functions or sub functions in matlab?

Dear all, I know how to save variables, but how can I save functions or sub functions in matlab? Thanks..

[Stephen23]

How are you trying to define this function?

[methaq ali]

Dear Stephen, I make copy for this code:

function [m,s] = stat(x)
n = length(x);
m = sum(x)/n;
s = sqrt(sum((x-m).^2/n));
end

% Call the function from the command line.

values = [12.7, 45.4, 98.9, 26.6, 53.1];
[ave,stdev] = stat(values)

Directly from Matlab help to my matlab R2014a editor I get this message in command win.:

function [m,s] = stat(x)
 |
Error: Function definitions are not permitted in this context.

Thanks..

Answer 1

[Stephen23]

It is not clear from your explanation where you are defining the function, but I can see two main possibilities which would generate that error (or a similar error):

• Trying to define a function in the command window: this is not allowed in MATLAB, all functions must be saved in a file (except for anonymous functions).
• Trying to define a function inside a script: only MATLAB versions from R2016B+ support functions defined in scripts. You need to read the documentation carefully for your version, not the online help (which is for the most recent version): for your MATLAB version it is not possible to define a function inside a script.

In practice if you want to define a function then do NOT have any code outside of any function declaration, e.g. this needs to be the entire file contents:

function [m,s] = stat(x)
n = length(x);
m = sum(x)/n;
s = sqrt(sum((x-m).^2/n));
end

You can add local functions to the same file, but NO CODE outside of those functions. Save the function as a file stat.m (you should use the same name as the function itself). Then it will work.

Answer 2

[KSSV]

function c = mysum(a,b)
 c = a+b ;
end

The above is a function.....as I have named it mysum, when you try to save, it will be automatically saved on the name mysum.m.

[Walter Roberson]

Note that this is not the MATLAB command save() being referred to, it is the editor menu save.

[methaq ali]

Thank you for answering my quastion but when copy this code to matlab the following error massage appear: function c = mysum(a,b ) | Error: Function definitions are not permitted in this context. I dont Know why!

[Dennis]

Try to create a script (top left -> New Script).