function tf = trans_function(theta);
%
%******************************************************************
% This function performs the transformation from 
% theta in [0, pi] to z in [L_END;R_END] using the transformation
% 
% z= .5*((R_END-L_END)*cos(theta)+L_END+R_END);
%
% and returns the value f(z), where f is a user specified function.
%
% Input
%
% theta         value in interval [0, pi]
%
% Global Variables
%
% f              Function name. Must be a string variable f='name'.
%                The user must construct an m-file that takes a scaler as
%                input and gives the scaler value of the function as output.
%                The name of the function must be assigned to the string 
%                variable f.
% L_END, R_END   The interval [L_END,R_END] is the domain of the function f
%
% Output
%
% tf              = f(z)
%************************************************************************
%
% Declare global variables
global L_END
global R_END
global f

% First executable statement
%
%************************************************
% Your code goes here:
%
% Transform from theta to z
%
% Evaluate f(z)
%************************************************

return
%
%***End of function