For an alternative approach to your original goal, take a look at
demoSource() in the SoDA package from CRAN. It's a bit tedious to set
up (see the Details section of the help file) but uses standard R
sessions to mix lines from a demo file and interactive input.
John
Jon Clayden wrote:
Dear all,
I have asked before, in R-help [1], about a way to create an
interactive session in which commands are taken from a file or
standard input - like R CMD BATCH but additionally allowing user input
- but there was no response to that question, and the workarounds that
I have found (using "expect", creating a temporary .Rprofile) are ugly
and problematic.
With the appearance of the --interactive flag in R 2.7.0 I thought
this might become possible, but it not only does not behave as I would
expect, it appears to go into an infinite loop, and uses 100% CPU
until killed.
$ echo 'print(readline("Input:"))' | R --no-save --quiet
> print(readline("Input:"))
Input:[1] ""
>
[no interactivity]
$ echo 'print(readline("Input:"))' | R --no-save --quiet --interactive
[no response at all]
This behaviour remains in the latest alphas of R 2.8.0. My platform is
Mac OS X.5.5 on Intel Core 2 Duo.
I assume, given this outcome, that this is not the intended use of
--interactive, but I still wonder if there is any way to achieve an
interactive session based on a predefined set of commands without
writing a completely new front-end (overkill, surely?).
Any guidance would be appreciated.
Regards,
Jon
[1] http://finzi.psych.upenn.edu/R/Rhelp02a/archive/117412.html
--
Jonathan D. Clayden, Ph.D.
Research Fellow
Radiology and Physics Unit
UCL Institute of Child Health
30 Guilford Street
LONDON WC1N 1EH
United Kingdom
t | +44 (0)20 7905 2708
f | +44 (0)20 7905 2358
w | www.homepages.ucl.ac.uk/~sejjjd2/
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