dcg(Wzp,pp)

This function gives you a representation in dc form of your transfer functions

This function allows you to visualize any trasnfer function (defined in s domain) in the dc gain form.
The standard call is dcg(Wzp,prec). Wzp is the transfer function input that must be given in tf matlab format, while prec corresponds to the value of digits in the parameter (precision) that you want to visualize. If not any value is passed the default value it's set to 4.
Remember that for definition, a dc gain form, is possible only and only if the system is at least of type greater or equal 0.