psinfo

Purpose

Inquire about polytopic or parameter-dependent systems created with psys

Syntax

• psinfo(ps) 
  [type,k,ns,ni,no] = psinfo(ps) 
  pv = psinfo(ps,'par') 
  sk = psinfo(ps,'sys',k) 
  sys = psinfo(ps,'eval',p) 
  

Description

psinfo is a multi-usage function for queries about a polytopic or parameter-dependent system ps created with psys. It performs the following operations depending on the calling sequence:

• psinfo(ps) displays the type of system (affine or polytopic); the number k of SYSTEM matrices involved in its definition; and the numbers of ns, ni, no of states, inputs, and outputs of the system. This information can be optionally stored in MATLAB^® variables by providing output arguments.
• pv = psinfo(ps,'par') returns the parameter vector description (for parameter-dependent systems only).
• sk = psinfo(ps,'sys',k) returns the k-th SYSTEM matrix involved in the definition of ps. The ranking k is relative to the list of systems syslist used in psys.
• sys = psinfo(ps,'eval',p) instantiates the system for a given vector p of parameter values or polytopic coordinates.

• For affine parameter-dependent systems defined by the SYSTEM matrices S0, S1, . . ., Sn, the entries of p should be real parameter values p1, . . ., pn and the result is the LTI system of SYSTEM matrix

S(p) = S0 + p1S1 + . . .+ pnSn

• For polytopic systems with SYSTEM matrix ranging in

Co{S1, . . ., Sn},

• the entries of p should be polytopic coordinates p1, . . ., pn satisfying pj 0 and the result is the interpolated LTI system of SYSTEM matrix

• 

See Also

psys        Specification of uncertain state-space models

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