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