Symbolic Math Toolbox    
iztrans
Inverse z-transform.

Syntax

Description
f = iztrans(F) is the inverse z-transform of the scalar symbolic object F with default independent variable z. The default return is a function of n.

where R is a positive number chosen so that the function F(z) is analytic on and outside the circle |z| = R.

If F = F(n), iztrans returns a function of k.

f = iztrans(F,k) makes f a function of k instead of the default n. Here k is a scalar symbolic object.

f = iztrans(F,w,k) takes F to be a function of w instead of the default findsym(F) and returns a function of k.

Examples

Inverse Z-Transform
 MATLAB Operation






f = 2*z/(z-2)^2


iztrans(f)
returns

2^n*n






g = n*(n+1)/(n^2+2*n+1)


iztrans(g)
returns

(-1)^k






f = z/(z-a)


iztrans(f,k)
returns

a^k






f = x*(x-exp(z))/
(x^2-2*x*exp(z)+exp(2*z))


iztrans(f,x,k)
returns
exp(z)^k


See Also
ifourier, ilaplace, ztrans


 inv jacobian