When I try and to z transformations and inverse z transformations using the Heaviside function as follows Maple doesn't seem to be able to handle it; does anyone have suggestions?

ztrans(Heaviside(n-No),n,z) assuming No:posint

would expect z^(-No) * z/(z-1) but no results, does work if No replaced by a specific integer

Similarly, ztrans(x(n-No),n,z) assuming No:posint  acts the same.

Hi, I'm trying to use rsolve to solve the difference equaiton: y(n)-3*y(n-1)-4*y(n-2)=delta(n)+2*delta(n-1)  where deta(n) is the discrete delta function represented by charfcn[0](n).  The answer should be y(n)=(-1/5)*(-1)^n+(6/5)*4^n.  I'm getting the answer in terms of y(0) and y(1) and extra terms.  Can someone point me in the right direction?

Thanks for your help

Hi, can someone tell me how to approach converting an expression is z to one in powers of z^-1?

For example, express f(z) = z/(z-1) as 1/(1-z^-1) ?

Thanks

Can someone point me in the right direction?  I want to simplify equations of the type:  4*2^n into 2^(n+2).

Thanks!

Hi, I'm having trouble getting Maple to solve the following simple inequality: H:=sqrt(1-0.3*sin(f)^2), solve(H>.9).  I get no solutions regarless of assumptions ect.  However, solve(H^2>0.9) works fine.  Anyone know whats going on?

thanks