Version: 0.10.0
Depends: R (≥ 3.1.2)
Suggests: R.utils, R.rsp, markdown
VignetteBuilder: R.rsp
Title: Environments Behaving (Almost) as Lists
Description: List environments are environments that have list-like properties. For instance, the elements of a list environment are ordered and can be accessed and iterated over using index subsetting, e.g. 'x <- listenv(a = 1, b = 2); for (i in seq_along(x)) x[[i]] <- x[[i]] ^ 2; y <- as.list(x)'.
License: LGPL-2.1 | LGPL-3 [expanded from: LGPL (≥ 2.1)]
LazyLoad: TRUE
URL: https://listenv.futureverse.org, https://github.com/futureverse/listenv
BugReports: https://github.com/futureverse/listenv/issues
RoxygenNote: 7.3.3
NeedsCompilation: no
Packaged: 2025-11-02 02:21:56 UTC; hb
Author: Henrik Bengtsson [aut, cre, cph]
Maintainer: Henrik Bengtsson <henrikb@braju.com>
Repository: CRAN
Date/Publication: 2025-11-02 06:40:02 UTC

Set an element of list environment

Description

Set an element of list environment

Usage

## S3 replacement method for class 'listenv'
x$name <- value

Arguments

x

A list environment.

name

Name or index of element

value

The value to assign to the element

Get elements of list environment

Description

Get elements of list environment

Usage

## S3 method for class 'listenv'
x$name

Arguments

x

A list environment.

name

The name or index of the element to retrieve.

Value

The value of an element or NULL if the element does not exist.

Transpose a 'listenv' array by permuting its dimensions

Description

Transpose a 'listenv' array by permuting its dimensions

Usage

## S3 method for class 'listenv'
aperm(a, perm, ...)

## S3 method for class 'listenv'
t(x)

Arguments

a, x

(listenv) The list environment to be transposed

perm

(integer vector) An index vector of length dim(a)

...

Additional arguments passed to base::aperm().

Value

Returns a list environment with permuted dimensions

See Also

These functions works like base::aperm() and base::t().

Examples

x <- as.listenv(1:6)
dim(x) <- c(2, 3)
dimnames(x) <- list(letters[1:2], LETTERS[1:3])
print(x)

x <- t(x)
print(x)

x <- aperm(x, perm = 2:1)
print(x)

List representation of a list environment

Description

List representation of a list environment

Usage

## S3 method for class 'listenv'
as.list(x, all.names = TRUE, sorted = FALSE, ...)

Arguments

x

A list environment.

all.names

If TRUE, element names starting with a period are included, otherwise not.

sorted

If TRUE, elements are ordered by their names before being compared, otherwise not.

...

Not used.

Value

A list.

Set the dimension of an object

Description

Set the dimension of an object

Usage

dim_na(x) <- value

Arguments

x

An R object, e.g. a list environment, a matrix, an array, or a data frame.

value

A numeric vector coerced to integers. If one of the elements is missing, then its value is inferred from the other elements (which must be non-missing) and the length of x.

Value

An object with the dimensions set, similar to what dim(x) <- value returns.

Examples

x <- 1:6
dim_na(x) <- c(2, NA)
print(dim(x))  ## [1] 2 3

Get name of variable for a specific element of list environment

Description

Get name of variable for a specific element of list environment

Usage

get_variable(...)

## S3 method for class 'listenv'
get_variable(x, name, mustExist = FALSE, create = !mustExist, ...)

Arguments

x

A list environment.

name

The name or index of element of interest.

mustExist

If TRUE, an error is generated if name does not exist.

create

If TRUE, element name is created if missing.

Value

The name of the underlying variable

Number of elements in list environment

Description

Number of elements in list environment

Usage

## S3 method for class 'listenv'
length(x)

Arguments

x

A list environment.

Create a list environment

Description

Create a list environment

Usage

listenv(...)

as.listenv(...)

Arguments

...

(optional) Named and/or unnamed objects to be assigned to the list environment.

Value

An environment of class listenv.

Examples

x <- listenv(c = 2, a = 3, d = "hello")
print(names(x))
names(x)[2] <- "A"
x$b <- 5:8

y <- as.list(x)
str(y)

z <- as.listenv(y)

Name map for elements of list environment

Description

Warning: map() is defunct - use mapping() instead.

Usage

mapping(x, ...)

map(x, ...)

Arguments

x

A list environment.

Value

A named character vector

Names of elements in list environment

Description

Names of elements in list environment

Usage

## S3 method for class 'listenv'
names(x)

Arguments

x

A list environment.

Helper function to infer target from expression and environment

Description

Helper function to infer target from expression and environment

Usage

parse_env_subset(
  expr,
  envir = parent.frame(),
  substitute = TRUE,
  is_variable = TRUE
)

Arguments

expr

An expression.

envir

An environment.

substitute

If TRUE, then the expression is base::substitute():ed, otherwise not.

is_variable

(logical) If TRUE and an element name is specified, then the name is checked to be a valid variable name.

Value

A named list with elements:

envir

An environment (defaults to argument envir)

name

A character vector. ...

op

...

subset

A list of NULL. ...

idx

An integer vector or NULL. ...

exists

A logical vector of length length(idx) with TRUE and FALSE values.

code

The deparsed expression expr coerced to a single character string.

Removes the dimension of an object

Description

Removes the dimension of an object

Usage

undim(x, ...)

Arguments

x

An object with or without dimensions

...

Not used.

Details

This function does attr(x, "dim") <- NULL, which automatically also does attr(x, "dimnames") <- NULL. However, other attributes such as names attributes are preserved, which is not the case if one do dim(x) <- NULL.

Value

The object with the dimension attribute removed.

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