class R

R server wrapper

The purpose of this class is to allow us to easily send R commands to the R server, process and return the results.

R.exec is the key entry point

Public Class Methods

exec(args={}) click to toggle source

Execute a block of R commands, using optional syntactic sugar, returning the results

Creates a new connection to the RServe after every connection.

Example:

require 'r'

R.exec do

a 'x', 2
a 'y', 4
ve 'x = -x'
xy = e "x + y"
xdivy = e "x / y"
[xy, xdivy]

end

> [2, -0.5]¶ ↑

# File lib/r.rb, line 29
def self.exec args={}, &block
  raise "Expected hash, keys will be defined as R variable names, example: {xvals: [1,2,3], yvals: [3,2,1]}" unless args.is_a?(Hash)
  begin
    conn = Rserve::Connection.new
    dsl = R::RserveConnectionDsl.new conn, args
    res = dsl.instance_eval &block
    dsl.clear   # since connection is recycled, make an attempt to clean up all defined vars
    return res
  rescue => e
    conn = dsl = nil    # ensure cleanup
    raise e
  end
end