ex: Extract Parts of an Object with Varnames and Units Attributes

In lsigut/openeddy: Post-process eddy covariance data with ease

Extract Parts of an Object with Varnames and Units Attributes

Description

Conserves varnames and units attributes of vectors and data frames during extraction.

Usage

ex(x, i, j, drop = TRUE)

Arguments

x	An atomic type or a data frame. Object from which to extract element(s).
i, j	Indices specifying elements to extract as specified in Extract.
drop	A logical value. If TRUE (default), the result is coerced to the lowest possible dimension.

Details

Extraction from atomic types is done as x[i] ignoring j and drop (applies also to matrices and arrays). Extraction from data frames is done as x[i, j, drop].

Value

A vector or data frame with varnames and units attributes.

See Also

Extract, drop and varnames.

Examples

xx <- data.frame(lengths = 1:3, areas = 4:6)
varnames(xx) <- c("lengths", "areas")
units(xx) <- c("m", "m2")
str(xx)

# extract specified rows and columns
str(ex(xx, 1:2, 1:2))
# extract specified rows
str(ex(xx, 1))
# extract specified columns
str(ex(xx, , 1))
# extract without dropping current class
ex(xx, , 1, drop = FALSE)
# extract elements of a vector
ex(xx$lengths, 2:3)

lsigut/openeddy documentation built on Aug. 5, 2023, 12:25 a.m.