— Function File: sys = sysappend (syst, b, c, d, outname, inname, yd)

appends new inputs and/or outputs to a system

Inputs

syst

system data structure

b

matrix to be appended to sys "B" matrix (empty if none)

c

matrix to be appended to sys "C" matrix (empty if none)

d

revised sys d matrix (can be passed as [] if the revised d is all zeros)

outname

list of names for new outputs

inname

list of names for new inputs

yd

binary vector; yd(ii)=0 indicates a continuous output; yd(ii)=1 indicates a discrete output.

Outputs

sys

               sys.b := [syst.b , b]
               sys.c := [syst.c  ]
               [ c     ]
               sys.d := [syst.d | D12 ]
               [ D21   | D22 ]

where D12, D21, and D22 are the appropriate dimensioned blocks of the input parameter d.

• The leading block D11 of d is ignored.
• If inname and outname are not given as arguments, the new inputs and outputs are be assigned default names.
• yd is a binary vector of length rows(c) that indicates continuous/sampled outputs. Default value for yd is:
  • sys is continuous or mixed yd = zeros(1,rows(c))
  • sys is discrete yd = ones(1,rows(c))