|Bode plot of frequency response, or magnitude and phase data|
|Bode magnitude response of LTI models|
|Plot input-output data|
|Analysis and recommendations for data or estimated linear models|
|Estimate time delay (dead time) from data|
|Determine whether model parameters or data values are real|
|Determine whether iddata is based on real-valued signals|
|Identify possible feedback data|
|Level of excitation of input signals|
|Nonparameteric impulse response estimation|
|Estimate empirical transfer functions and periodograms|
|Estimate frequency response with fixed frequency resolution using spectral analysis|
|Estimate frequency response and spectrum using spectral analysis with frequency-dependent resolution|
|Option set for iddata/plot|
After importing data into the System Identification app, as described in Represent Data, you can plot the data.
The following table summarizes the commands available for plotting time-domain, frequency-domain, and frequency-response data.
You can use the
advice command to analyze time- or frequency- domain data before estimating a model.
You can use transient-response plots to estimate the input delay, or dead time, of linear systems.
Before you start estimating models from data, you should check your data for the presence of any undesirable characteristics.