peaks {splus2R}R Documentation

Local maxima

Description

Finds the local maxima in a vector, or time series, or in each column of a matrix.

Usage

peaks(x, span=3, strict=TRUE)

Arguments

x vector or matrix.
span a peak is defined as an element in a sequence which is greater than all other elements within a window of width span centered at that element. The default value is 3, meaning that a peak is bigger than both of its neighbors. Default: 3.
strict logical flag: if TRUE, an element must be strictly greater than all other values in its window to be considered a peak. Default: TRUE.

Value

an object like x of logical values. Values that are TRUE correspond to local peaks in the data.

See Also

anyMissing, as.rectangular, colIds, colMaxs, colMedians, colMins, colRanges, colStdevs, colVars, deparseText, ifelse1, is.numeric.atomic.vector, is.rectangular, is.missing, is.zero, lowerCase, oldUnclass, numCols, numRows, positions, rowIds, rowMaxs, rmvnorm, stdev, subscript2d, upperCase, vecnorm, which.na.

Examples

x <- as.vector(sunspots)
z <- peaks(x, span=51)
plot(x, type="l")
abline(v=which(z), col="red", lty="dashed")

[Package splus2R version 1.0-1 Index]