Iddata Source

Import time-domain data stored in iddata object in MATLAB workspace

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Libraries:
System Identification Toolbox

Description

The Iddata Source block imports the input-output time-domain data stored in an iddata object in the MATLAB^® workspace. You can use this block to import data for simulating a model in Simulink^®.

Examples

Simulate Nonlinear ARX Model in Simulink

Compare the simulated output of a Nonlinear ARX Model block to the measured output of a system. You improve the agreement between the measured and simulated responses by estimating initial state values.

• Open Script

Ports

Output

Input — Input data stored in iddata object

scalar | vector

Input data stored in iddata object, returned as a scalar for single-input data and a vector of length Nu for multichannel data with Nu inputs. If z is the iddata object, the output at this port at simulation time t is z.InputData at time t. If t is greater than z.SamplingInstants(end), the maximum time in z, the input data is returned as 0 for each input channel.

Data Types: double

Output — Output data stored in iddata object

scalar | vector

Output data stored in iddata object, returned as a scalar for single-output data and as a vector of length Ny for multichannel data with Ny outputs. If z is the iddata object, the output at this port at simulation time t is z.OutputData at time t. If t is greater than z.SamplingInstants(end), the maximum time in z, the output data is returned as 0 for each output channel.

Data Types: double

Parameters

IDDATA object — Time-domain data to be imported

iddata(1,1) (default) | iddata object

Time-domain data that is to be imported, specified as an iddata object that you have created in the MATLAB workspace. The iddata object must contain only one experiment. For a multiple-experiment iddata object z, to specify an iddata object for experiment number kexp, specify IDDATA object as getexp(z,kexp).

Start time — Start time for signals in iddata object

-1 (default) | non-negative real scalar

Start time for signals in the iddata object, specified as -1 or a non-negative real scalar. The default value of -1 means that this start time matches that of the Simulink model. To specify the start time of the signals to be the same as that of the iddata object, set the Start time to data.Tstart, where data is the iddata object.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2008a