Hi David,
thats interesting, I'll keep it in mind for the future.
The solution I came up with involved using PHP to attach a script string
to the end of the command line that starts up R like:
$R_script = "R --silent --slave 2>&1 << 'END'" . $R_script;
$R_script .= "quit()\n";
$R_script .= "END\n";
$file_pointer = popen($R_script. "r");
$R_script_result = "";
while(!feop($file_pointer))
{
$R_script_result .= fread($file_pointer, 1024);
}
pclose($file_pointer);
The script string was then massaged to extract the values I needed.
In my case I used R to format a string that was a PHP script,
extracted this from $R_script_result and performed a PHP eval on it
so I did not have to do any complex parsing stuff.
Hopes this helps you some time.
Regards from Richard
"David B. Dahl" wrote:
Richard,
I run into this problem when trying to control R from a Java program.
Hopefully my solution can help you.
After poking around the source code, I realized that when R starts up, it
choose between interactive or non-interactive mode, based on whether there is
a controlling TTY. Specifically, line 237 of src/unix/system.c has the line
"R_Interactive = isatty(0);" My solution is to insert the following line
immediately after line 237:
"if ( getenv("R_FORCE_INTERACTIVE") != NULL ) R_Interactive = TRUE;"
I then compile R. (You implied that you were adverse to learning how to
compile from source, but it really isn't hard. See "R Installation and
Administration" documentation from the R webpage.)
Then, within Java, I set the environment variable "R_FORCE_INTERACTIVE" to
"true" and launch R. I can then write commands to R and read the response,
all without buffering or flushing issues.
I hope this helps. I would be interest in knowing how well this works for you
or what other solution you come up with.
- - David Dahl
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._