Create vector/matrix inside function

Hi All,

I have a simple function file.

If I put something like this inside the function file; A = [1 2 3 4];

It will display this in the command window;

A = 1 2 3 4

But it won't save A in the Workspace as a vector.

How can I create a vector inside a function file and have that vector saved to my Workspace?

Thanks!

Answer 1

[Stephen23]

You return it as an output argument.

http://www.mathworks.com/help/matlab/function-basics.html

Like the MATLAB documentation clearly states, the best practice is to pass arguments:

http://www.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html

So your function could be something like:

 function [ct,A] = critPT( ... )
 ...
 A = ...
 ct = ...
 ...
 end

and then call it:

[NewCT,newA] = critPT(...)

Note: the fact that you do not "see" the variable A in the base workspace is the whole point of functions: they should have independent workspaces, so that what happens inside any one function does not affect any other workspace. That is the point.

[Tejay Lovelock]

Thanks for that!

Answer 2

[Stefan Raab]

Hello,

this is because functions have their own workspace. There is a good explanation in the MATLAB doc, please execute the following commands in the MATLAB Command Window to open the help browser:

• Information on workspaces in general:

web(fullfile(docroot, 'matlab/matlab_prog/base-and-function-workspaces.html'))

• Information on how to share data between workspaces:

web(fullfile(docroot, 'matlab/matlab_prog/share-data-between-workspaces.html'))

I hope this will help you.

Kind regards, Stefan

[Tejay Lovelock]

Thanks Stefan

[Stefan Raab]

Ah, I was too slow :)