National Instruments NI MATRIXx Xmath - Manual (Page 110)

Chapter 6 Tutorial
© National Instruments Corporation 6-15 Xmath Model Reduction Module
Generate Figure 6-11:
tvec=0:(140/99):140;
compare(syscl,sysclr,tvec,{type=7})
f11=plot({keep,legend=["original","reduced"]})
Figure 6-11. Step Response with wtbalance
Figures 6-9, 6-10, and 6-11 are obtained for wtbalance with the option
"input spec" . Evidently, there is little difference between this and the
result with the option "match" . One notices marginally better matching in
the region of interest (0.1 to 5 rad per second) at the expense of matching
at other frequencies. The weighted Hankel singular values again indicate
that it is reasonable to seek a second order controller.