As Jason Turner told you, one possibility is to use the communication
interface SJava (for another documentation, see this article: Urbanek,
S. (2002)
"No need to talk to strangers - Cooperation of Interactive Software with
R as Moderator",
http://simon.urbanek.info/simon/yawe/research/pub.html) but it seems not
so easy to use (but if you want to do sophisticated things from what
I've heard you should use SJava).
Here are other alternatives that are easy to implement and that you
should consider depending on what you want to do:
1- one is to use R in batch mode ie you create a file in your java code
with all the R commands and send it to R (via Process
pc=Runtime.getRuntime().exec(Rcall); )and then R creates an outputfile
with all the results.
The matter with this is that there is no interactivity, variables are
not kept, you have to parse the outputfile, ... (see the above article
(see ? FFinterface))
2- another one is to use the R server developed by Simon Urbanek:
http://stats.math.uni-augsburg.de/Rserve/
A java frontend is provided with the server, which allows to communicate
easily with R and which sends back results in a java object. So for each
connection to the server you have a R environment where all the variable
generated are kept until you close the connection and from you java code
it is as simple as this example: REXP mean =
c.eval("mean"+i+"<-apply("+data+"[,data.cl=="+(i-1)+"],1,mean.na)");
This is what I'am using in my application and I am quite satisfied with
it.
Hope this helps,
Laetitia.
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