[R] Command line R / PHP?
Thomas W Blackwell
tblackw at umich.edu
Tue Aug 19 14:14:45 CEST 2003
On Wed, 20 Aug 2003, Zitan Broth wrote:
. . .
> What I am trying to do is use R as part of a web-based system and call R
> from PHP. The common method of interfacing from PHP to many systems is via
> the command line (although I could use swig to access R directly but that is
> phase 2 ;-) ). I found in the install notes that I could call
> Rterm.exe --no-restore --no-save < infile > outfile (windows, although I
> will be rolling out to *nix) however I cannot find a reference of how to
> call r-functions from the command line with this -- or perhaps I've missed
> the point ?
infile is an ascii file of R commands - the same commands and same syntax
which you would type in the R command line window. Frequently the first
line sets some session options using options(), the second line reads
some data from a separate, named file into an R object, and the third and
subsequent lines operate on that data and print out the results.
options(digits=4, width=88, length=1e+8)
object <- read.table("data.file")
summary(lm(y ~ 1 + a + b, object)
(This assumes that "data.file" contains columns named a, b, y in any
order. It does a linear regression and prints out the results .. in
the command line window if you were working interactively, but to
outfile if R is running noninteractively with the call above.)
(Gosh, my recollection is that in unix the call is R BATCH infile outfile,
but I could be mistaken. That's on the unix man page for R if you forget.)
> I did find in the FAQ: 7.22 How can I get command line editing to work? But
> I'm not sure I understand the answer ..
If running R non-interactively, you don't care.
> So say as a simple example I want to call sd() (standard deviation) from the
> command line what would I type ... or do I need to write some R code and
> call this .. ?
Need code to read in the data, then a one line command sd(object).
The returned value is printed automatically if it is not assigned.
> I will continue to read .... Z.
HTH - tom blackwell - u michigan medical school - ann arbor -
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