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Descriptive Statistics

Peaks, RMS level, peak-to-peak amplitude, crest factor, dynamic time warping, CUSUM control chart, edit distance

Use findpeaks to locate the local maxima of a signal and sort the peaks by height, width, or prominence. Determine the crest factor of a signal using the peak2rms function and compute common descriptive statistics like maxima, minima, standard deviations, and RMS levels. Search for signals of interest in larger data sets and align signals in time. Locate points where a signal changes abruptly or drifts beyond a target range.

Functions

 cummax Cumulative maximum cummin Cumulative minimum envelope Signal envelope max Largest elements in array mean Average or mean value of array meanfreq Mean frequency medfreq Median frequency median Median value of array min Smallest elements in array movmad Moving median absolute deviation movmedian Moving median peak2peak Maximum-to-minimum difference peak2rms Peak-magnitude-to-RMS ratio rms Root-mean-square level rssq Root-sum-of-squares level seqperiod Compute period of sequence std Standard deviation var Variance
 alignsignals Align two signals by delaying earliest signal cusum Detect small changes in mean using cumulative sum dtw Distance between signals using dynamic time warping edr Edit distance on real signals findchangepts Find abrupt changes in signal finddelay Estimate delay(s) between signals findpeaks Find local maxima findsignal Find signal location using similarity search

Apps

 Signal Analyzer Visualize and compare multiple signals and spectra

Topics

RMS Value of Periodic Waveforms

Find the root mean square value of a sine wave, a square wave, and a rectangular pulse train.

Peak Analysis

Find peaks in a noisy signal, and measure their amplitude and the distance between them.

Find Peaks in Data

Locate the local maxima in a set of data and determine if those peaks occur periodically.

Prominence

The prominence of a peak measures how much the peak stands out due to its intrinsic height and its location relative to other peaks.