Determines all the local extreme values of a vector.

Syntax

e, i = Peaks(m, option)

Argument

Name

Description

m

A vector which is scanned for extrema.

option (optional)

Indicates the type of extrema to search.

option = 'min': only minima.

option = 'both': minima and maxima.

option = 'max': only maxima.

The default is ‘both’.

Output

Name

Description

e

A vector of the extreme values.

i

The indices of the extrema in the vector. It has the same length as the extrema vector.

Example

Find the local minima in a given vector:

Syntax

E,I = Peaks([2, 5, -1, 4, 3, 3, 5, 7], ’min’)

Result

E = -1  3  3

I =  3  5  6

Comments

A value is considered to be a local maximum if it is greater than or equal to each of its neighboring values. A value is considered to be a local minimum if it is less than or equal to each of its neighboring values. End points are not considered extrema.