Function problem once again

Consider the following function and its helper function.

%   1   function E = notebook(in1)
%   2   E = helper(in1);
%   3   end
%   4
%   5   function out3 = helper(in)
%   6   out3 = mod(in,2);
%   7   end

The following code is written in the Command Window and runs without error:

%   >> E = 5;
%   >> F = notebook(E*2);

% Identify the value of the variable E in each of the following Workspaces. % Write DNE if E is not defined in a particular Workspace.

% The value of E in the notebook function Workspace is: J = 0;

Why isn't it 0? And if not, what is the value of E in the notebook function Workspace?

[per isakson]

notebook is a function of Matlab. Overloading of Matlab functions may cause unexpected behavior. Try to avoid that.

Your functions, notebook and helper, behaves according to my expectations. "Why isn't it 0?" &nbsp It is 0. Obviously, I don't understand the question.

[Stephen23]

"Why isn't it 0?"

Why do you think that it isn't zero ?

When I run the code shown above, E is definitely zero inside the notebook workspace:

 >> E = 5;
 >> notebook(E*2)
 ans = 0