Control System Toolbox™

isproper - Determine whether LTI model is proper

Syntax

isproper(sys)

Description

isproper(sys) returns 1 (true) if the LTI model sys is proper and 0 (false) otherwise.

State-space models are always proper. SISO transfer functions or zero-pole-gain models are proper if the degree of their numerator is less than or equal to the degree of their denominator. MIMO transfer functions are proper if all their SISO entries are proper.

Example

The following commands

isproper(tf([1 0],1))         % transfer function s
isproper(tf([1 0],[1 1]))    % transfer function s/(s+1)

return false and true, respectively.

isempty

lti/isstable