R help - Nov 2009 - Passing MULTIPLE arguments from php file to r scripts

Hi friends,
Again i don't know how to pass multiple arguments from php file to r
scripts.

Please have a look at this link ; it gives a very simple explanation of
passing variables from a PHP page to r scipts.Because i have done the same
thing.

http://www.math.ncu.edu.tw/~chenwc/R_note/index.php?item=php&subitem=ex_1<http://www.math.ncu.edu.tw/%7Echenwc/R_note/index.php?item=php&subitem=ex_1>

*CONTENTS OF MY PHP FILE: ex_1.php*

<?php**

$cmd = "echo 'argv1 <- \"ex_1.R\"; source(argv1)' |
" .

         "/usr/bin/R --vanilla --slave ";

 $ret = system($cmd);

?>

Assigned the file name to argv1 and passed argv1 to source() function for
running r scripts

*CONTENTS OF MY R FILE: ex_1.r*

print("hello")

print(argv1)

When I open the php file in the browser I get these results:---

[1] "hello" [1] "ex_1.R"

See here the php file could invoked the desired r script as well as pass the
argument argv1 from the php file and made it available to the r script

Till passing of one argument everything was fine.

*Then I changed the php file ex_1.php:---*

<?php**

  $a=1;

 $cmd = "echo 'argv1 <- \"ex_1.R\"; source(argv1)' |
" .

         "/usr/bin/R --vanilla --slave ";

//print($cmd);

  $ret = system($cmd);

?>

*Then I changed the r script ex_1.r:---*

print("hello")

print(argv1)

print(argv2)



When I ran the php file neither the php file could invoke the r script nor
the arguments got printed(none of the arghuments got printed,not even argv1
)

So with this change in $cmd :--

$cmd = "echo 'argv1 <- \"ex_1.R\"; source(argv1)' |
" ."echo 'argv2
<-".$a."; source(argv1)' | " ."/usr/bin/R --vanilla
--slave";



Nothing worked.

Again when I changed $cmd to this :--

$cmd = "echo 'argv1 <- \"ex_1.R\"; source(argv1)' |
" ."echo 'argv2
<-".$a."; source(argv1)' | " ."/usr/bin/R --vanilla
--slave--args";

The r script could be invoked and bothe the arguments were available but
with warnings:-

WARNING: unknown option '--slave--args' R version 2.7.1 (2008-06-23)
Copyright (C) 2008 The R Foundation for Statistical Computing ISBN
3-900051-07-0 R is free software and comes with ABSOLUTELY NO WARRANTY. You
are welcome to redistribute it under certain conditions. Type
'license()' or
'licence()' for distribution details. R is a collaborative project with
many
contributors. Type 'contributors()' for more information and
'citation()' on
how to cite R or R packages in publications. Type 'demo()' for some
demos,
'help()' for on-line help, or 'help.start()' for an HTML browser
interface
to help. Type 'q()' to quit R. > argv2 <-1; source(argv1)



*How should I pass multiple arguments from a php page to invoke a r scripts
as well as make the arguments passed available to the r script?*


Thanks
Moumita

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