This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

Represent Data

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


iddata Time- or frequency-domain data
idfrd Frequency-response data or model
idinput Generate input signals
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 iddata object to MATLAB workspace
IDDATA Source Import iddata object from MATLAB workspace

Examples and How To

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.

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.

Operations that Create idfrd Objects

How to create idfrd objects.

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.

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.

Managing idfrd Objects

Subreferencing and concatenating idfrd objects

Manipulating Complex-Valued Data

Supported operations and limitations for handling complex data and commands for manipulating complex signals.

Was this topic helpful?