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I am developing an application that uses Eclipse framework on Windows. I have to call R from Java. I downloaded rJava package and installed it. I set the classpath in the Run Dialog in Eclipse to the directory where the JRI.jar is. I set the Path environmental variable to the directory where R.dll and jri.dll are. Yet when I run the rtest example (in jri/examples directory), I get the

I want to take the first row of each unique ID value from a data frame. For instance > ddTable <- data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry")) I want a dataset that is Id Name 1 Paul 2 Bob > unique(ddTable) Will give me all 4 rows, and > unique(ddTable$Id) Will give me c(1,2), but not accompanied by the name column.