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

       Davor Cubranic <cubranic@stat.ubc.ca>

       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.

       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

perl v5.34.0                                       2022-02-10               Statistics::R::REXP::Expression(3pm)

       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".

       "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.

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

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

           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;

       version 1.0002