MATLAB: Nested function not assigning value to global variable

global variablesubfunction

My main script invites a subfunction, which then invites different subfunctions. I want these subfunctions to modify global variables. A simpified example:
 a=9;
 b=2;
 global p 
 myfunc(a,b);
 display Result:
 p
 function [varargout] = myfunc(a,b);
 arr=[a;b];
 varargout={arr};
 end
 mysecondfunction(arr);
 prod = arr(1)*arr(2);
 p = prod;
 end
When the main script calls p again it is empty. Why is this so and how can I fix it?

Best Answer

You have to assign p...you have not yet assigned it.
a=9;
 b=2;
 global p 
p = rand ;
 myfunc(a,b);
 display Result:
 p
 function [varargout] = myfunc(a,b);
 arr=[a;b];
 varargout={arr};
 end
 mysecondfunction(arr);
 prod = arr(1)*arr(2);
 p = prod;
 end
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