# peak: Find Peaks and Valleys In A Series In quantmod: Quantitative Financial Modelling Framework

## Description

Functions to find the peaks (tops) and valleys (bottoms) of a given series.

## Usage

 ```1 2``` ```findPeaks(x, thresh=0) findValleys(x, thresh=0) ```

## Arguments

 `x` a time series or vector `thresh` minimum peak/valley threshold

## Value

A vector of integers corresponding to peaks/valleys.

As a peak[valley] is defined as the highest[lowest] value in a series, the function can only define it after a change in direction has occurred. This means that the function will always return the first period after the peak/valley of the data, so as not to accidentally induce a look-ahead bias.

Jeffrey A. Ryan

## Examples

 ```1 2 3 4 5 6 7 8``` ```findPeaks(sin(1:10)) p <- findPeaks(sin(seq(1,10,.1))) sin(seq(1,10,.1))[p] plot(sin(seq(1,10,.1))[p]) plot(sin(seq(1,10,.1)),type='l') points(p,sin(seq(1,10,.1))[p]) ```

### Example output

```Loading required package: xts

Attaching package: 'zoo'

The following objects are masked from 'package:base':

as.Date, as.Date.numeric