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`	Evaluate system response over a grid of frequencies
`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`	频率响应的仅幅度波特图
`nyquist`	动态系统的奈奎斯特响应
`nyquistplot`	Plot Nyquist response of dynamic system
`iopzmap`	Plot pole-zero map for input-output pairs of dynamic system using default options
`iopzplot`	Plot pole-zero map for input-output pairs of dynamic system
`showConfidence`	Display confidence regions on response plots for identified models

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.
Plot the Noise Spectrum Using the System Identification App
To create a noise spectrum plot for parametric linear models in the app, select the Noise spectrum check box in the Model Views area.
Plot the Noise Spectrum at the Command Line
To plot the disturbance spectrum of an input-output model or the output spectrum of a time series model, use 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.