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데이터 분석하기
지연, 피드백, 가진 레벨과 같은 데이터 특성 확인
함수
bode | 주파수 응답, 또는 크기 및 위상 데이터의 보드 플롯 |
bodemag | 주파수 응답의 크기 전용 보드 플롯 |
plot | Plot input and output channels of estimation data |
advice | Analysis and recommendations for data or estimated linear models |
delayest | 데이터를 바탕으로 시간 지연(불감 시간) 추정 |
isreal | Determine whether model parameters or data values are real |
realdata | Determine whether iddata is based on
real-valued signals |
feedback | 가능한 피드백 데이터 식별 |
pexcit | Level of excitation of input signals |
impulseest | Nonparametric impulse response estimation |
etfe | Estimate empirical transfer functions and periodograms |
spa | Estimate frequency response with fixed frequency resolution using spectral analysis |
spafdr | Estimate frequency response and spectrum using spectral analysis with frequency-dependent resolution |
iddataPlotOptions | Option set for idplot when plotting input/output estimation data
contained in a timetable, numeric matrices, or an iddata
object |
예제 및 방법
- How to Plot Data in the App
After importing data into the System Identification app, as described in 데이터 표현하기, you can plot the data.
- How to Plot Data at the Command Line
The following table summarizes the commands available for plotting time-domain, frequency-domain, and frequency-response data.
- How to Analyze Data Using the advice Command
You can use the
advice
command to analyze time- or frequency- domain data before estimating a model. - Identify Delay Using Transient-Response Plots
You can use transient-response plots to estimate the input delay, or dead time, of linear systems.
개념
- Is Your Data Ready for Modeling?
Before you start estimating models from data, you should check your data for the presence of any undesirable characteristics.