不确定性分析

计算参数变异性，绘制置信边界

当您根据数据估计模型参数时，您会获得在置信域内准确的标称值。该域的大小由估计期间计算的参数不确定性的值决定。不确定性的程度可衡量模型的可靠性。您可以计算并可视化参数不确定性对时域和频域模型响应的影响。

函数

`simsd`	Simulate linear models with uncertainty using Monte Carlo method
`simsdOptions`	Option set for `simsd`
`freqresp`	在频率网格上评估系统响应
`rsample`	Random sampling of linear identified systems

`getcov`	Parameter covariance of identified model
`setcov`	Set parameter covariance data in identified model
`translatecov`	Translate parameter covariance across model transformation operations

`step`	动态系统的阶跃响应
`stepplot`	Plot step response of dynamic system
`impulse`	动态系统的冲激响应图；冲激响应数据
`bode`	动态系统的波特频率响应
`bodemag`	Magnitude-only Bode plot of frequency response
`nyquist`	动态系统的奈奎斯特响应
`nyquistplot`	Plot Nyquist response of dynamic system
`iopzmap`	使用默认选项绘制动态系统的 I/O 对组的零极点图
`iopzplot`	Plot pole-zero map for input-output pairs of dynamic system
`showConfidence`	在响应图上显示已辨识模型的置信边界

Compute Model Uncertainty
Compute model parameter uncertainty of linear models.
Plot Impulse and Step Response Using the System Identification App
To create a transient analysis plot in the System Identification app, select the Transient resp check box in the Model Views area.
Plot Bode Plots Using the System Identification App
To create a frequency-response plot for linear models in the System Identification app, select the Frequency resp check box in the Model Views area.
使用系统辨识 App 绘制噪声频谱
要在该 App 中为参数线性模型生成频谱图，请在 Model Views 区域中选中 Noise spectrum 复选框。有关创建和使用绘图的一般信息，请参阅Working with Plots。
在命令行中绘制噪声频谱
要绘制输入-输出模型的频谱或时间序列模型的输出频谱，请使用 spectrum。
Model Poles and Zeros Using the System Identification App
To create a pole-zero plot for parametric linear models in the System Identification app, select the Zeros and poles check box in the Model Views area.