period.apply

0th

Percentile

Apply Function Over Specified Interval

Apply a specified function to data over a given interval, where the interval is taken to be the data from INDEX[k] to INDEX[k+1], for k=1:(length(INDEX)-1).

Keywords
utilities
Usage
period.apply(x, INDEX, FUN, ...)
Arguments
x

data to apply FUN to

INDEX

numeric vector specifying indexing

FUN

an argument of type function

additional arguments for FUN

Details

Similar to the rest of the apply family, calculate a specified functions value given a shifting set of data values. The primary difference is that it is that period.apply applies a function to non-overlapping intervals along a vector.

Useful for applying arbitrary functions over an entire data object by an aribirtary index, as when INDEX is the result of a call to breakpoints.

Value

A vector with length of INDEX minus 1

See Also

endpoints apply.monthly

Aliases
  • period.apply
Examples
library(xts) # NOT RUN { zoo.data <- zoo(rnorm(31)+10,as.Date(13514:13744,origin="1970-01-01")) ep <- endpoints(zoo.data,'weeks') period.apply(zoo.data, INDEX=ep, FUN=function(x) mean(x)) period.apply(zoo.data, INDEX=ep, FUN=mean) #same glue <- function(x) { paste(x,collapse='') } period.apply(letters,c(0,5,7,26),glue) # }
Documentation reproduced from package xts, version 0.9-7, License: GPL (>= 2)

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