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Actually I do want to use to function lsim, and that’s why I need to transform Q(s) [i.e.: Q(s)=4*s^2+1] from "sym-object" to "tf-object". Why do I have Q(s) as a "sym-object"? well, i had to made several previous calculus and as I a have 3 variables y need to define s as symbolic

hi i have the same problem... did you find the solution? regards, gabi

hi i have a polynomial expression: Q(s)=4*S^2+1, defined as “symbolic” but I need it as “tf-object” (defined as a transfer function) to be used in the matlab command "lsim", anyone knows how to do it? thanks gabi

how can i make what you say? In fact i dont really understand what you want to say.... gabi

i finally found the function: "subs" olé!!!!!

Hi i would like to know if there is any function that can be used to change a symbolic variable with another one (i.e: a polynomial expression is function of time, “t”, and as I need to make a convolution I would like to change it, lets say by tau, “tau”). gabi

Hi i would like to know if there is any function that can be used to reduce the size of polynomial expression (i have a huge one, with several terms and i must made an approximation because my computer can not finish the calculus once i use it in a function) gabi