# localmin: calculate a local minimum In erpR: Event-related potentials (ERP) analysis, graphics and utility functions

## Description

The function calculates a local minimum of the vector `x` surrounded by at least `n.points` higher numbers.

## Usage

 `1` ```localmin(x, n.points = 2) ```

## Arguments

 `x` a vector of numbers. `n.points` a minimum number of higher values to determine the local minimum (see Details). Default is two points.

## Details

The function calculates a local minimum of the vector `x`, i.e. the lowest value of the vector `x` surrounded by at least `n` higher numbers. The concept of the local minimum applied to ERP analysis is taken from Luck (2005).

## Value

The local minimum of the vector `x` is returned.

Giorgio Arcara

## References

Luck, S., J. (2005). An Introduction to the Event-Related Potential Technique. Cambridge, Mass.: The MIT Press.

## Examples

 ```1 2 3 4``` ```x=seq(-5.5,1,0.001) y=-(sin(x)+0.3*x) plot(x,y, type="l") abline(h=localmin(y)) #print an horizontal line intersecting the local minimum ```

erpR documentation built on May 31, 2017, 5:01 a.m.