clc
clear all
disp('PURPOSE')
disp('  Show how to use symbolic characters')
disp('EXAMPLES')
% using symbolic ops
disp('Example 1 - Symbolic operations')
syms t r s    % t r and s are now symbolic varibles
a  =t^2+r;
y  =t^3+a+s;
eqn=char(y);  %char will convert the equation to a string
fprintf('  The symbolic equation is\n  %s\n\n',eqn)
% using the inline command
% inline function is y(t)=t^2+7t+9
disp('Example 2 - The inline command')
y   =inline('t^2+7*t+9');
yeqn=char(y);
% find the value of y(a) using the inline notation
% a=4
a=4;
ya=y(a);
fprintf('  The function is: y(t)=%s\n',yeqn)
fprintf('  y(%g)=%g\n\n',a,ya)