User`s guide

Representing Time- and Frequency-Domain Data Using iddata Objects
Naming, Adding,
and Removing Data Channels
• “WhatAreInputa
nd Output Channels?” on page 1-63
• “Naming Channel
s” on page 1-63
• “Adding Channel
s” on page 1-64
• “Modifying Chan
nel Data” on page 1-64
What Are Input and Output Channels?
Amultivariates
ystem might contain several input variables or several output
variables, or bo
th. When an input or output signal includes several measured
variables, the
se variables a re called channels.
Naming Channels
The iddata prop
erties
InputName and OutputName store one or more channel
names for the in
put and output signals. When you plot the data, you use
channel names
to select the variable displayed on the plot. If you have
multivariate
data, you should assign a name to each channel that describes
the measured v
ariable. For m ore information about selecting channels on a
plot, see “Sel
ecting Measured and Noise Channels in Plots” on page 12-18.
You can use the
set command to specify the names of individual channels.
For example,
suppose
data contains two input channels (voltage and current)
and one outpu
t channel (temperature). To set these channel names, use the
following s
yntax:
set(data,'InputName',{'Voltage','Curr ent'},
'OutputName','Temperature')
Tip You can al
so specify channel names as follows:
data.una = {'Voltage','Current')
data.yna = 'Temperature'
una
is equiva
lent to the property
InputName,andyna is equivalent to
OutputName
.
1-63