Statistics::R question

david_lyon has asked for the wisdom of the Perl Monks concerning the following question:

Hello Perl Monks

Statistics::R questions

this works:

$R->send(q`a<-read.table("/usr/local/projects/file")`);
[download]

this doesnt work:


$file="/usr/local/projects/file";
$R->send(q`a<-read.table($file)`);
[download]

Does anybody know how I get the above working?

Many Thanks Perl Monks

Comment on Statistics::R question Select or Download Code

Replies are listed 'Best First'.
Re: Statistics::R question by Corion (Patriarch) on Apr 06, 2011 at 11:04 UTC
Use my $command = q`a<-read.table("/usr/local/projects/file")`; print "Running [$command]\n"; $R->send($command); [download] and my $file="/usr/local/projects/file"; my $command = q`a<-read.table($file)`; print "Running [$command]\n"; $R->send($command); [download] to see what happens and what the first cause is. Then look at perlop, especially at the "Quotes and Quote-like operators" to see what causes this behaviour of Perl and what to change.	[reply] [d/l] [select]
Re^2: Statistics::R question by david_lyon (Sexton) on Apr 06, 2011 at 13:49 UTC
Thanks corion for your pointer to help. This now works, not sure if its the proper way. my $file="/usr/local/projects/file"; my $command = "a<-read.table(\"$file\")"; print "Running $command\n"; $R->send($command); Thanks again!	[reply]
Re: Statistics::R question by wind (Priest) on Apr 07, 2011 at 01:08 UTC
q doesn't interpolate. You wanted qq instead or "..." like you used in the end. Also, I would shy away from using backticks as your separator as that can be confused with qx. `my $file = '/usr/local/projects/file'; $R->send(qq{a<-read.table("$file")});` [download]	[reply] [d/l]
Re^2: Statistics::R question by david_lyon (Sexton) on Apr 08, 2011 at 00:34 UTC
Thanks for your help wind, very useful, I will be using that from now onwards	[reply]