FindPeaks

FindPeaks[data]

gives positions and values of the detected peaks in data.

FindPeaks[data,σ]

finds peaks that survive Gaussian blurring up to scale σ.

FindPeaks[data,σ,s]

finds peaks with minimum sharpness s.

FindPeaks[data,σ,s,t]

finds only peaks with values greater than t.

FindPeaks[data,σ,{s,σs},{t,σt}]

uses different scales for thresholding sharpness and value.

Details and Options

  • FindPeaks finds local maxima using the given constraints, returning the result as {{x1,f1},{x2,f2},…}.
  • Input data can be of one of the following forms:
  • {y1,y2,…}a list of values
    TimeSeries[…]regularly sampled time series object
    EventSeries[…]regularly sampled event series object
  • FindPeaks[data] automatically chooses constraints to return a set of peaks.
  • FindPeaks[data,0,0,-∞] returns all the peaks.
  • FindPeaks[data,σ,s,t] is equivalent to FindPeaks[data,σ,{s,σ},{t,0}].
  • The following options can be given:
  • InterpolationOrderAutomaticspline interpolation order of up to order 3
    Padding"Reversed"padding scheme to use

Examples

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Basic Examples  (1)

Find position and height of dominant peaks in a list:

Visualize list and the detected peaks:

Scope  (12)

Data  (4)

Peaks of a 1D list:

Peaks of a TimeSeries object:

Peaks of an EventSeries object:

Find peaks:

Peaks of a list of Quantity objects:

Threshold for values greater than 30 meters:

Parameters  (8)

By default, an automatic scale is used:

Find all peaks at scale :

Compute peaks at different scales:

When finding peaks at scale , only peaks that sustain a blur up to scale are returned:

Signal and its blurred version at scale :

By default, peaks are not filtered based on their sharpness, equivalent to :

Specify minimum sharpness value :

Sharpness, defined by the negative second derivative, should be greater than the specified s:

Specify a minimum height value :

Apply the value threshold after smoothing the data using a scale :

Options  (3)

InterpolationOrder  (1)

By default, InterpolationOrder->1 is used:

Find peaks of the cubic interpolation:

Padding  (2)

By default, Padding->"Reversed" is used:

Specify a constant padding:

Detection and position of boundary peaks may vary depending on the padding value:

Applications  (3)

Find peaks in the stock price of Apple in one year:

Highlight peaks on the plot of the data:

Find peaks in elevation data:

Mean daily temperatures for Chicago during a period of two months:

Find peaks in the temperature:

Introduced in 2014
 (10.0)