Specifications

3 Operations on LTI Models
3-4
•In general, when two LTI models sys1 and sys2 are combined using
operations such as
+, *, [,], [;], append,andfeedback,theresultingmodel
inherits its I/O names and I/O groups from
sys1 and sys2. However,
conflicting I/O names or I/O groups are not inherited. For example, the
InputName property for sys1 + sys2 is left unspecified if sys1 and sys2 have
different
InputName property values.
•A model resulting from operations on TF or ZPK models inherits its
Variable propertyvalue fromtheoperands.Conflicts areresolvedaccording
the following rules:
- For continuous-time models,
'p' has precedence over 's'.
- For discrete-time models,
'z^–1' has precedence over 'q' and 'z', while
'q' has precedence over 'z'.