Types of Data You Can Model :: Data Import and Processing (System Identification Toolbox™)

Types of Data You Can Model

System Identification Toolbox software supports estimation of linear models from both time- and frequency-domain data. For nonlinear models, this toolbox supports only time-domain data.

The data can have single or multiple inputs and outputs, and can be either real or complex.

Your data should be sampled at discrete and uniformly spaced time instants to obtain an input sequence

u={u(T),u(2T),...,u(NT)}

and a corresponding output sequence

y={y(T),y(2T),...,y(NT)}

u(t) and y(t) are the values of the input and output signals at time t, respectively.

This toolbox supports modeling both single- or multiple-channel input-output data or time-series data.

Supported Data	Description
Time-domain I/O data	One or more input variables u(t) and one or more output variables y(t), sampled as a function of time. Time-domain data can be either real or complex
Time-series data	Contains one or more outputs y(t) and no measured input. Can be time-domain or frequency-domain data.
Frequency-domain data	Fourier transform of the input and output time-domain signals.
Frequency-response data	Complex frequency-response values for a linear system characterized by its transfer function G, measurable directly using a spectrum analyzer. Also called frequency function data.

Supported Data

Description

Time-domain I/O data

One or more input variables u(t) and one or more output variables y(t), sampled as a function of time. Time-domain data can be either real or complex

Time-series data

Contains one or more outputs y(t) and no measured input. Can be time-domain or frequency-domain data.

Frequency-domain data

Fourier transform of the input and output time-domain signals.

Frequency-response data

Complex frequency-response values for a linear system characterized by its transfer function G, measurable directly using a spectrum analyzer. Also called frequency function data.

Note If your data is complex valued, see Manipulating Complex-Valued Data for information about supported operations for complex data.

Data Import and Processing

Ways to Process Data for System Identification

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