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.\" ========================================================================
.\"
.IX Title "Statistics::R::REXP::Expression 3pm"
.TH Statistics::R::REXP::Expression 3pm "2022-02-10" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Statistics::R::REXP::Expression \- an R expression vector
.SH "VERSION"
.IX Header "VERSION"
version 1.0002
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    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(\*(Aq+\*(Aq),
\&            Statistics::R::REXP::Double\->new([1]),
\&            Statistics::R::REXP::Double\->new([2])
\&    ])]);
\&    print $vec\->elements;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
An object of this class represents an R expression vectors
(\f(CW\*(C`EXPRSXP\*(C'\fR). These objects represent a list of calls, symbols, etc.,
for example as returned by calling R function \f(CW\*(C`parse\*(C'\fR or
\&\f(CW\*(C`expression\*(C'\fR.
.SH "METHODS"
.IX Header "METHODS"
\&\f(CW\*(C`Statistics::R::REXP:Expression\*(C'\fR inherits from
Statistics::R::REXP::List, with no added restrictions on the value
of its elements.
.IP "sexptype" 4
.IX Item "sexptype"
\&\s-1SEXPTYPE\s0 of expressions is \f(CW\*(C`EXPRSXP\*(C'\fR.
.IP "to_pl" 4
.IX Item "to_pl"
Perl value of the expression vector is an array reference to the Perl
values of its \f(CW\*(C`elements\*(C'\fR. (That is, it's equivalent to \f(CW\*(C`map
{$_\-\*(C'\fRto_pl}, \f(CW$vec\fR\->elements>.) Unlike List, elements that are
atomic vectors of length 1 are still represented as a one-element
array reference, rather than scalar values.
.SH "BUGS AND LIMITATIONS"
.IX Header "BUGS AND LIMITATIONS"
Classes in the \f(CW\*(C`REXP\*(C'\fR hierarchy are intended to be immutable. Please
do not try to change their value or attributes.
.PP
There are no known bugs in this module. Please see
Statistics::R::IO for bug reporting.
.SH "SUPPORT"
.IX Header "SUPPORT"
See Statistics::R::IO for support and contact information.
.SH "AUTHOR"
.IX Header "AUTHOR"
Davor Cubranic <cubranic@stat.ubc.ca>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is Copyright (c) 2017 by University of British Columbia.
.PP
This is free software, licensed under:
.PP
.Vb 1
\&  The GNU General Public License, Version 3, June 2007
.Ve