


GPM Get process model specified by gain, delay and time constant.
Usage: GPM(K,L,T,type) Returns a plant model, specified by type:
'fopdt' G = K / (1+T*s) * exp(-L)
'ipdt' G = K / s * exp(-L)
'foipdt' G = K / s * (1+T*s) * exp(-L)