---
name: "Statistics::R::REXP::Expression"
section: "3pm"
platform: "linux"
package: "libstatistics-r-io-perl"
version: "1.0002-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Statistics::R::REXP::Expression"
---

# Statistics::R::REXP::Expression(3pm)

an R expression vector

## NAME

Statistics::R::REXP::Expression - an R expression vector

## VERSION

version 1.0002

## SYNOPSIS

```
    use Statistics::R::REXP::Expression

    # Representation of the R call C<expresson(1 + 2))>:
    my $vec = Statistics::R::REXP::Expression->new([
        Statistics::R::REXP::Language->new([
            Statistics::R::REXP::Symbol->new('+'),
            Statistics::R::REXP::Double->new([1]),
            Statistics::R::REXP::Double->new([2])
    ])]);
    print $vec->elements;
```

## DESCRIPTION

An object of this class represents an R expression vectors (`"EXPRSXP"`). These objects represent a list of calls, symbols, etc., for example as returned by calling R function `"parse"` or `"expression"`.

## METHODS

`"Statistics::R::REXP:Expression"` inherits from Statistics::R::REXP::List, with no added restrictions on the value of its elements.

- sexptype

  SEXPTYPE of expressions is `"EXPRSXP"`.

- to\_pl

  Perl value of the expression vector is an array reference to the Perl values of its `"elements"`. (That is, it's equivalent to `"map` `{$_-"`to\_pl}, `$vec`-\>elements\>.) Unlike List, elements that are atomic vectors of length 1 are still represented as a one-element array reference, rather than scalar values.

## BUGS AND LIMITATIONS

Classes in the `"REXP"` hierarchy are intended to be immutable. Please do not try to change their value or attributes.

There are no known bugs in this module. Please see Statistics::R::IO for bug reporting.

## SUPPORT

See Statistics::R::IO for support and contact information.

## AUTHOR

Davor Cubranic \<cubranic@stat.ubc.ca\>

## COPYRIGHT AND LICENSE

This software is Copyright (c) 2017 by University of British Columbia.

This is free software, licensed under:

```
  The GNU General Public License, Version 3, June 2007
```