period.sum {quantmod}R Documentation

Calculate Sum By Period

Description

Calculate a sum for each period of INDEX. Essentially a rolling application of sum over a series of non-overlapping sections.

Usage

period.sum(x, INDEX)

Arguments

x a univariate data object
INDEX a vector of breakpoints to calculate sum on

Details

Used to calculate a sum per period given an arbitrary index of sections to be calculated over. This is an optimized function for sum. There are additionally optimized versions for min, max, and prod.

Value

A numeric vector of sums per period.

Author(s)

Jeffrey A. Ryan

See Also

period.max, period.min, period.prod

Examples

period.sum(c(1,1,4,2,2,6,7,8,-1,20),c(0,3,5,8,10))
[Package quantmod version 0.3-2 Index]