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  1. thefantasticme

    from symbolic to tf_object

    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
  2. thefantasticme

    change symbolic variable by another

    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
  3. thefantasticme

    simplifly polynomial expression

    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

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