Identifying a variable in Matlab

%characteristic function; w=2*pi/t j=sqrt(-1) syms x Phaiz=int(exp(j*w*x)*y, a, b)

How do I identify t as time, and can some one correct the code please

Answer 1

[Walter Roberson]

 %characteristic function;
 syms t
 w = 2*pi/t;
 j = sqrt(-1);
 syms a b x y
 assume(a>=0 & b>=a)
 Phaiz = int(exp(j*w*x)*y, t, a, b)

Phaiz =