Scala2R is a thin Scala wrapper around JRI. It allows a slightly more natural use of R from Scala for some common functions. For further functionality you may need to delve deeper into JRI.
The wrapper requires R and JRI to be installed and for use to have both the JRI jar files in the classpath and the JRI native libraries in the library path.
The functionality supported at the moment is based on what I currently use for producing graphs and statistics for my experiments. If you need more, please ask me.
Typical usage is:
val r = com.hjl.scala2R.R() import r._ pdf( new File( "blah.pdf" )) plot( Array( 1, 2, 3, 3, 4 ))
Functions are called with variable arguments. Each argument is either a value or a pair where the first element is a symbol or string and the second is a value. The pair format allow for named arguments to be passed to R.
Values are one of
- None - Becomes
nullin R - Boolean
- Float
- Double
- Int
- Long
- String
- java.io.File
- java.awt.Color
- Sequence of Number
- Sequence of String
- Symbol - The symbol text will be used verbatim in the R code. Typically this is for variable names, but can be used for more general R escaping purposes
So, if you would call in R pdf( "hello.pdf", paper="a4", width=5 ), then in Scala you would call:
pdf( new File( "hello.pdf" ), 'paper->"a4", 'width->5 ).
Similarly, if you want plot( c( 1,2,2.5 ), c( 4,2,3 ), col="#FF0000" ), then you would use:
plot( Array( 1,2,2.5 ), Array( 4,2,3 ), 'col->new Color( 255, 0, 0 )).
NOTE: This code is really just here because I use it and wanted some source control that someone else would manage. I'm happy for you to use it of course, but I don't stand by it or think it's good. The lack of documentation, etc., is intentional! (Well, really, it's more that this code is often throw away for experiments than anything else).