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Spab
Posts:
2
Registered:
12/11/04


another symbolic expression problem
Posted:
Jul 19, 1996 1:03 AM


hi!
I have another problem with the symbolic expression.
I tried to plot f(t) = t[ u(t)  u(t2)] (while u(t) is the unit step response. Here is the function define u(t)
 function f = Heaviside(t)
%HEAVISIDE Unit Step function % f = Heaviside(t) returns a vector f the same size as % the input vector, where each element of f is 1 if the % corresponding element of t is greater than or equal to % zero.
f = (t>=0) ;  Here is the script I wrote for plotting f(t) = t[ u(t)  u(t2)]
t = 1:0.2:3; a = Heaviside([1:0.2:3]); b = Heaviside([2:0.2:2]); ft =sym('t*(ab)'); ezplot(ft,t)
This is the error I got
??? Error using ==> ezplot Symbolic variable not uniquely determined
Can anyone tell me what's wrong?
Mukaya



