nexus (version 0.3.0)

split: Divide into Groups

Description

Divides the compositional matrix x into the groups defined by f.

Usage

# S4 method for CompositionMatrix
split(x, f, drop = FALSE, ...)
# S4 method for LogRatio
split(x, f, drop = FALSE, ...)

Value

A list of CompositionMatrix objects.

Arguments

x

A CompositionMatrix object.

f

A 'factor' in the sense that as.factor(f) defines the grouping, or a list of such factors in which case their interaction is used for the grouping (see base::split()).

drop

A logical scalar: should levels that do not occur be dropped?

...

Currently not used.

Author

N. Frerebeau

See Also

Other subsetting methods: bind, extract(), subset()

Examples

## Create a data.frame
X <- data.frame(
  samples = c("A", "A", "A", "B", "B", "B", "C", "C", "C"),
  groups = c("X", "X", "X", "X", NA, NA, "Y", "Y", "Y"),
  Ca = c(7.72, 7.32, 3.11, 7.19, 7.41, 5, 4.18, 1, 4.51),
  Fe = c(6.12, 5.88, 5.12, 6.18, 6.02, 7.14, 5.25, 5.28, 5.72),
  Na = c(0.97, 1.59, 1.25, 0.86, 0.76, 0.51, 0.75, 0.52, 0.56)
)

## Coerce to a compositional matrix
Y <- as_composition(X)

## Split by group
## /!\ Unassigned samples are discarded ! /!\
(s1 <- split(Y, f = X$groups))

## Split by group
## Keep unassigned samples, see help(factor)
(s2 <- split(Y, f = factor(X$groups, exclude = NULL)))

## Bind by rows
do.call(rbind, s2)