R: Find Maxima and Minima

hilow {RSEIS} | R Documentation

## Find Maxima and Minima

### Description

Search for Extrema along time series

### Usage

    hilow(y)

### Arguments

`y` | time series

### Value

LIST:

`hi` | indexes to peaks
`lo` | indexes to valleys

### Author(s)

Jonathan M. Lees<jonathan.lees.edu>

### See Also

peaks

### Examples

    ex <- seq(from=0, to=4*pi, length = 200)

    y <- sin(ex)
    plot(ex, y, type='l')

    peakval <- hilow(y)

    abline(v=ex[peakval$hi], col='green')
    abline(v=ex[peakval$lo], col='red')

[Package RSEIS version 3.7-4 Index]