
for example it can solve (s^5+s^3-12s^2+3)/(s^5-s^4-s^2+5)
in my case i only need this because i do other thinks like time shift on my own,but if you have any idea for adding lap and z-trans or solve problems in ilap or iz in cases like exp(s)/(s+1),please contact me.
my email is mortezahaydari AT yahoo.com
i had also written some numerical caclculating programs...