Represent Data

Measure or generate data, import in GUI or represent using data objects, manipulate complex data

Functions

`timetable`	Timetable array with time-stamped rows and variables of different types
`iddata`	Input-output data and its properties for system identification in the time or frequency domain
`idfrd`	Frequency response data or model
`idinput`	Generate input signals to support system identification
`sim`	Simulate response of identified model
`size`	Query output/input/array dimensions of input–output model and number of frequencies of FRD model

midprefs Specify location for file containing System Identification app startup information

simOptions Option set for sim

Iddata Sink	Export simulation data as `iddata` object to MATLAB workspace
Iddata Source	Import time-domain data stored in `iddata` object in MATLAB workspace

Import Time-Domain Data into the App
Import time-domain data into the System Identification app
Import Frequency-Domain Data into the App
Import frequency-domain input-output data and frequency-response data into the System Identification app.
Import Data Objects into the App
Import iddata and idfrd data objects.
Data Types in System Identification Toolbox
This example describes data types and formats that System Identification Toolbox™ supports.
Convert SISO Matrix Data to Timetable
Convert matrix-based SISO estimation data to timetables for model identification.
Convert MIMO Matrix Data to Timetable for Continuous-Time Model Estimation
Estimate a continuous-time MIMO model by first converting matrix-based data to a timetable.
Generate Data Using Simulation
Creating input data with specific characteristics and simulating the output data from a model.

Representing Data in MATLAB Workspace
Represent time-domain, time-series, and frequency-domain data.
Requirements on Data Sampling
The toolbox provides limited support for nonuniformly sampled data.
Specifying the Data Sample Time
Specify time between successive data samples.
Managing Data in the App
You can get information about each data set in the System Identification app by right-clicking the corresponding data icon.
Representing Time- and Frequency-Domain Data Using iddata Objects
Using the iddata constructor to represent time-domain and frequency-domain data and working with iddata objects.
Managing iddata Objects
The iddata object stores time-domain data or frequency-domain data and has several properties that specify the time or frequency values.
Representing Frequency-Response Data Using idfrd Objects
Using the idfrd constructor to represent frequency-response data and working with idfrd objects.
Manipulating Complex-Valued Data
Supported operations and limitations for handling complex data and commands for manipulating complex signals.