Plot impulse response and return plot handle
impulseplot(sys)
impulseplot(sys,Tfinal)
impulseplot(sys,t)
impulseplot(sys1,sys2,...,sysN)
impulseplot(sys1,sys2,...,sysN,Tfinal)
impulseplot(sys1,sys2,...,sysN,t)
impulseplot(AX,...)
impulseplot(..., plotoptions)
h = impulseplot(...)
impulseplot plots the impulse response of
the dynamic system model sys.
For multi-input models, independent impulse commands are applied to
each input channel. The time range and number of points are chosen
automatically. For continuous systems with direct feedthrough, the
infinite pulse at t=0 is disregarded. impulseplot can
also return the plot handle, h. You can use this
handle to customize the plot with the getoptions and setoptions commands.
Type
help timeoptions
for a list of available plot options.
impulseplot(sys) plots the impulse response
of the LTI model without returning the plot handle.
impulseplot(sys,Tfinal) simulates the impulse
response from t = 0 to the final time t
= Tfinal. Express Tfinal in the system
time units, specified in the TimeUnit property
of sys. For discrete-time systems with unspecified
sample time (Ts = -1), impulseplot interprets Tfinal as
the number of sampling intervals to simulate.
impulseplot(sys,t) uses the user-supplied
time vector t for simulation. Express t in
the system time units, specified in the TimeUnit property
of sys. For discrete-time models, t should
be of the form Ti:Ts:Tf, where Ts is
the sample time. For continuous-time models, t should
be of the form Ti:dt:Tf, where dt becomes
the sample time of a discrete approximation to the continuous system
(see impulse). The impulseplot command
always applies the impulse at t=0, regardless of Ti.
To plot the impulse response of multiple LTI models sys1,sys2,...
on a single plot, use:
impulseplot(sys1,sys2,...,sysN)
impulseplot(sys1,sys2,...,sysN,Tfinal)
impulseplot(sys1,sys2,...,sysN,t)
You can also specify a color, line style, and marker for each system, as in
impulseplot(sys1,'r',sys2,'y--',sys3,'gx')
impulseplot(AX,...) plots into the axes
with handle AX.
impulseplot(..., plotoptions) plots the
impulse response with the options specified in plotoptions.
Type
help timeoptions
for more detail.
h = impulseplot(...) plots the impulse
response and returns the plot handle h.
Normalize the impulse response of a third-order system.
sys = rss(3); h = impulseplot(sys); % Normalize responses setoptions(h,'Normalize','on');
Plot the impulse response and the corresponding 1 std "zero interval" of an identified linear system.
load(fullfile(matlabroot, 'toolbox', 'ident', 'iddemos', 'data', 'dcmotordata'));
z = iddata(y, u, 0.1, 'Name', 'DC-motor');
set(z, 'InputName', 'Voltage', 'InputUnit', 'V');
set(z, 'OutputName', {'Angular position', 'Angular velocity'});
set(z, 'OutputUnit', {'rad', 'rad/s'});
set(z, 'Tstart', 0, 'TimeUnit', 's');
model = n4sid(z,4,n4sidOptions('Focus', 'simulation'));
h = impulseplot(model,2);
showConfidence(h);You can change the properties of your plot, for example the units. For information on the ways to change properties of your plots, see Ways to Customize Plots.