BIOdry (version 0.9)

scacum: Cummulative-scaled sums

Description

This function computes cummulative and scaled sums of time-series replicates.

Usage

scacum(x, sc.c = NA, rf.t = NA)

Value

data frame with the original vector, and its scaled-cummulative sums.

Arguments

x

numeric vector of time-series replicates with names of the vector being time units.

sc.c

numeric constant. Scaling constant. If NA then the computed cumulative sums are not scaled.

rf.t

NA, or numeric constant. Reference time of the scaling constant. If NA then maximum time in vector-name range is used.

Author

Wilson Lara <[e-mail]>, Felipe Bravo <[e-mail]>

Details

Cummulative sums of time-series replicates (e.g. tree-ring widths) are scaled around reference values (e.g. tree radii).

Examples

x <- c(0.79,0.32,0.53,0.43,0.18)
names(x) <- 1948:1952
scacum(x,sc.c = 4,rf.t = 1951)

##If sc.c = NA then cummulative values are scaled arround
##max(cumsum(x)):
max(cumsum(x))
scacum(x,NA,1951)