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Response Computation and Visualization

Analyze model response on time- and frequency-response plots


simSimulate response of identified model
bodeBode plot of frequency response, or magnitude and phase data
bodeplotPlot Bode frequency response with additional plot customization options
bodemag Magnitude-only Bode plot of frequency response
stepStep response plot of dynamic system; step response data
stepplotPlot step response and return plot handle
stepinfoRise time, settling time, and other step-response characteristics
nyquistNyquist plot of frequency response
nyquistplotNyquist plot with additional plot customization options
impulseImpulse response plot of dynamic system; impulse response data
impulseplotPlot impulse response and return plot handle
pzmapPole-zero plot of dynamic system
pzplotPole-zero plot of dynamic system model with plot customization options
iopzmapPlot pole-zero map for I/O pairs of model
iopzplotPlot pole-zero map for I/O pairs and return plot handle
spectrumPlot or return output power spectrum of time series model or disturbance spectrum of linear input-output model
spectrumplotPlot disturbance spectrum of linear identified models
lsimPlot simulated time response of dynamic system to arbitrary inputs; simulated response data
lsimplotSimulate response of dynamic system to arbitrary inputs and return plot handle
lsiminfoCompute linear response characteristics
showConfidenceDisplay confidence regions on response plots for identified models
findstatesEstimate initial states of model
data2stateMap past data to states of state-space and nonlinear ARX models
simOptionsOption set for sim
stepDataOptionsOptions for the step command
bodeoptionsCreate list of Bode plot options
nyquistoptionsList of Nyquist plot options
timeoptionsCreate list of time plot options
getoptionsReturn @PlotOptions handle or plot options property
setoptionsSet plot options for response plot
pzoptionsCreate list of pole/zero plot options
spectrumoptionsOption set for spectrumplot
identprefSet System Identification Toolbox preferences
findstatesOptionsOption set for findstates


Analyzing MIMO Models

In analysis plots of multiple-input, multiple output LTI models, there are plot tools for selecting subsystems and grouping I/O pairs.

Customize Response Plots Using the Response Plots Property Editor

Set axes labels and limits, fonts, grids, and other attributes of response plots.

Toolbox Preferences Editor

Set plot preferences that persist from session to session.