Writing a csv file in R from Java using JRI

Question

Apologies in advance if this is obvious, but I can't seem to find an answer to it online. I was wondering if it is possible to write to a csv file in R from Java. For example, if I was to create normal data and write it to a csv file, I thought something like this might work:

Rengine re=new Rengine(args, false, new TextConsole());
re.eval("write.csv(rnorm(100,50,10), file='C:\\MyDocuments\\test.csv')")

Also, on a lesser note, if I create an object in R from java, is there any way to access it later? A simple example:

re.eval(x<-20)
re.eval(x<-x+40)

Please tell us what did happen. That makes it much easier to diagnose the problem. — Carl Witthoft
– Carl Witthoft, Commented Sep 19, 2011 at 12:34
It says: Error: '\D' is an unrecognized escape in character string starting "C:\D" The code does work in R — Aran Brady
– Aran Brady, Commented Sep 19, 2011 at 13:17
In that case, try "C:\\D" to escape the escape sequence. This is a common gotcha in bash scripting; I'm not expert enuff in Java to know where the command parsing takes place. — Carl Witthoft
– Carl Witthoft, Commented Sep 19, 2011 at 17:00

Aran Brady · Accepted Answer · 2011-11-07 12:26:34Z

2

As Carl mentions above, this has to do with the escape character "\". I had tried "\\" as you would in java, however, R also needs to escape the escape sequence; this is where I was getting caught. In the end 6 backslashes were needed.

answered Nov 7, 2011 at 12:26

Aran Brady

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