[R] S-Plus 2000 <-> R 1.0.1
bates at stat.wisc.edu
Sat Apr 29 17:39:57 CEST 2000
"Edward J. Czilli" <ejczilli at umich.edu> writes:
> Let's say that I have a data frame in S-Plus 2000 (Win98 version).
> I want to use the same data frame with R on another computer.
> 1) Can R read S-Plus data frames?
No, not directly. The simplest thing to do is to dump the data frame
from S-PLUS to an ASCII file and try to read that into R. Sometimes
that will work. Sometimes there are complications with the way
S-PLUS stores factors.
> Can S-Plus 2000 read R data frames?
The reverse route tends to work better. A file created by dump in R
tends to be easier to read into S-PLUS.
> 2) How can i move the data frame between the two systems? Do I
> need to use dump()?
That is probably the most effective way.
For example, in R use
`data.frame': 72 obs. of 2 variables:
$ count: num 10 7 20 14 14 12 10 23 17 20 ...
$ spray: Factor w/ 6 levels "A","B","C","D",..: 1 1 1 1 1 1 1 1 1 1 ...
> dump("InsectSprays", file = "InsectSprays.q")
If you start S-PLUS you should be able to use
to retrieve a copy of the frame.
For the list: When moving objects between computers in R one can use
the R save format (.rda files) because they use a machine-independent
representation. I believe the preferred way of doing this in S-PLUS
is still to use the S-PLUS data.dump format.
A good project for someone wanting to learn the internals of R would
be to create an R function that reads the S-PLUS data.dump format. It
would be a great advantage to use C code to read the file and create
the R structures. Read the manual "Writing R Extensions" before
trying to do this.
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