Prediction error for identified model
err = pe(sys,data,K)
err = pe(sys,data,K,opt)
[err,ice,sys_pred] = pe(___)
pe(sys,data,K,___)
pe(sys,Linespec,data,K,___)
pe(sys1,...,sysN,data,K,___)
pe(sys1,Linespec1,...,sysN,LinespecN,data,K,___)
returns theerr
= pe(sys
,data
,K
)K
-step prediction error for the output of the identified modelsys
. The prediction error is determined by subtracting theK
-step ahead predicted response from the measured output. The prediction error is calculated for the time span covered bydata
. For more information on the computation of predicted response, seepredict
.
returns the prediction error using the option set,err
= pe(sys
,data
,K
,opt
)opt
, to specify prediction error calculation behavior.
[
also returns the estimated initial conditions,err
,ice
,sys_pred
] = pe(___)ice
, and a predictor system,sys_pred
.
pe(
plots the prediction error. Use with any of the previous input argument combinations. To change display options in the plot, right-click the plot to access the context menu. For more details about the menu, seeTips.sys
,data
,K
,___)
pe(
usessys
,Linespec
,data
,K
,___)Linespec
to specify the line type, marker symbol, and color.
pe(sys1,...,sysN,
plots the prediction errors for multiple identified models.data
,K
,___)pe
automatically chooses colors and line styles.
pe(sys1,Linespec1,...,sysN,LinespecN,
使用线类型、标记符号和颜色specified for each model.data
,K
,___)
|
Identified model. |
|
Measured input-output history. If |
|
Prediction horizon. Specify Default: |
|
Prediction options.
|
|
Line style, marker, and color Line style, marker, and color, specified as a character vector. For example, For more information about configuring |
|
Prediction error.
Outputs up to the time When For multi-experiment data, |
|
Estimated initial conditions.
|
|
Predictor system.
For discrete-time data, For multi-experiment data, |
Right-clicking the plot of the prediction error opens the context menu, where you can access the following options:
Systems— Select systems to view prediction error. By default, the prediction error of all systems is plotted.
Data Experiment— For multi-experiment data only. Toggle between data from different experiments.
Characteristics— View the following data characteristics:
Peak Value— View the absolute peak value of the data. Applicable for time–domain data only.
Peak Response— View peak response of the data. Applicable for frequency–response data only.
Mean Value— View mean value of the data. Applicable for time–domain data only.
Show— For frequency–domain and frequency–response data only.
Magnitude— View magnitude of frequency response of the system.
Phase— View phase of frequency response of the system.
Show Validation Data— Plot data used to compute the prediction error.
I/O Grouping— For datasets containing more than one input or output channel. Select grouping of input and output channels on the plot.
None— Plot input-output channels in their own separate axes.
All— Group all input channels together and all output channels together.
I/O Selector— For datasets containing more than one input or output channel. Select a subset of the input and output channels to plot. By default, all output channels are plotted.
Grid— Add grids to the plot.
Normalize— Normalize the y-scale of all data in the plot.
Full View— Return to full view. By default, the plot is scaled to full view.
Prediction Horizon— Set the prediction horizon, or choose simulation.
Initial Condition— Specify handling of initial conditions. Not applicable for frequency-response data.
Specify as one of the following:
Estimate— Treat the initial conditions as estimation parameters.
Zero— Set all initial conditions to zero.
Absorb delays and estimate— Absorb nonzero delays into the model coefficients and treat the initial conditions as estimation parameters. Use this option for discrete-time models only.
Predicted Response Plot— Plot the predicted model response.
Prediction Error Plot— Plot the error between the model response and prediction data. By default, the error plot is shown.
Properties— Open the Property Editor dialog box to customize plot attributes.