Madame, I've read your answer for using R from Java, you've sais: 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. My question is how to do a process in Java and do I need to change the path of Java or R to let Java call R, What configuration should I do??? and Do I need to add somehting to a Java program ??? Thank you in advance Xena --------------------------------- [[alternative HTML version deleted]]