Statistics::R::IO::Rserve - Supply object methods for Rserve communication

       Davor Cubranic <cubranic@stat.ubc.ca>

       Instances  of  this  class  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::IO::Rserve(3pm)

       "Statistics::R::IO::Rserve" provides an object-oriented interface to communicate with the Rserve
       <http://www.rforge.net/Rserve/> binary R server.

       This allows Perl programs to access all facilities of R without the need to have a local install of R or
       link to an R library.

CONSTRUCTOR
       new $server
           The  single-argument  constructor can be invoked with a scalar containing the host name of the Rserve
           server. The method will immediately open a  connection  to  the  server  using  IO::Socket::INET  and
           perform  the  initial  steps  prescribed  by  the protocol. The method will raise an exception if the
           connection cannot be established or if the remote host does not appear to run the correct version  of
           Rserve.

       new $handle
           The  single-argument  constructor  can  be  invoked  with  an  instance  of IO::Handle containing the
           connection to the Rserve server, which becomes the 'fh' attribute.  The  caller  is  responsible  for
           ensuring that the connection is established and ready for submitting client requests.

       new ATTRIBUTE_HASH_OR_HASH_REF
           The  constructor's  arguments can also be given as a hash or hash reference, specifying values of the
           object attributes. The caller passing the handle is responsible for ensuring that the  connection  is
           established and ready for submitting client requests.

       new The  no-argument  constructor  uses the default server name 'localhost' and port 6311 and immediately
           opens a connection to the server using IO::Socket::INET, performing the initial steps  prescribed  by
           the  protocol.  The  method will raise an exception if the connection cannot be established or if the
           remote host does not appear to run the correct version of Rserve.

   ACCESSORS
       server
           Name of the Rserve server.

       port
           Port of the Rserve server.

       fh  A connection handle (stored as a reference to the IO::Handle) to the Rserve server.

   METHODS
       eval EXPR
           Evaluates   an   R   expression,   given   as    text    string    in    REXPR,    on    an    Rserve
           <http://www.rforge.net/Rserve/> server and returns its result as a Statistics::R::REXP object.

       ser_eval EXPR
           Evaluates    an    R    expression,    given    as    text    string   in   REXPR,   on   an   Rserve
           <http://www.rforge.net/Rserve/> server and returns its result as a Statistics::R::REXP  object.  This
           method uses the CMD_serEval Rserve command (code 0xf5), which is designated as "internal/special" and
           "should  not  be  used  by  clients".  Consequently,  it  is  not recommended to use this method in a
           production environment, but only to help debug cases where "eval" isn't working as desired.

       get_file REMOTE_NAME [, LOCAL_NAME]
           Transfers a file named REMOTE_NAME from the Rserve  server  to  the  local  machine,  copying  it  to
           LOCAL_NAME  if  it  is specified. The file is transferred in binary mode. Returns the contents of the
           file as a scalar.

       close
           Closes the object's filehandle. This method is automatically invoked when the object is destroyed  if
           the connection was opened by the constructor, but not if it was passed in as a pre-opened handle.

       Statistics::R::IO::Rserve - Supply object methods for Rserve communication

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

           use Statistics::R::IO::Rserve;

           my $rserve = Statistics::R::IO::RDS->new('someserver');
           my $var = $rserve->eval('1+1');
           print $var->to_pl;
           $rserve->close;

       version 1.0002