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Spab
Posts:
2
Registered:
12/11/04
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another symbolic expression problem
Posted:
Jul 19, 1996 1:03 AM
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hi!
I have another problem with the symbolic expression.
I tried to plot f(t) = t[ u(t) - u(t-2)] (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) ;
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Here is the script I wrote for plotting f(t) = t[ u(t) - u(t-2)]
t = -1:0.2:3;
a = Heaviside([-1:0.2:3]);
b = Heaviside([-2:0.2:2]);
ft =sym('t*(a-b)');
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
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