Message-ID: <200210312139.59114.dbdahl@stat.wisc.edu>
Date: 2002-11-01T03:39:59Z
From: David B. Dahl
Subject: Flushing the R output buffer.
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
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