symfun to sym conversion error only in a Function (not Script)

When I use the following code as a script it works without any error.

% function [A]=myFun()

syms t real %time
syms w(t) 
w=formula(w);   
% I use this to convert symFun to sym 
% so I can access to "A" matrix elements which uses w

A=[sin(w);cos(w)]; % "A" matrix is now a 2*1 sym instead of a 1*1 symfun

% end

But when I want to use the code inside a function which passes A matrix as an output, and I call the function I get this error:

"w" previously appeared to be

used as a function or command,

conflicting with its use here as

the name of a variable.

A possible cause of this error is

that you forgot to initialize the

variable, or you have initialized

it implicitly using load or eval.

[Walter Roberson]

Try using W=formula(w) and referring to W afterwards -- so that you are not overwriting function w with non-function w.

[amin ya]

Thank you, it works! It was as easy as changing the name.