plotx_vs_exp_x.rb

require 'rsruby'

r = RSRuby.instance

# mod of Peter Lane's Ruby for Scientific Research plot example                 
# construct data to plot, graph of x vs exp(x)                                  
xs = 10.times.collect {|i| i}
ys = xs.collect {|x| r.exp(x)}

r.png("exp_example.png")  # tell R we will create png file                      
r.plot(:x => xs,
     :y => ys,            # (x,y) coordinates to plot                           
     :type=> "o",         # draw a line through points                          
     :col=> "blue",       # colour the line blue                                
     :main=> "Plot of x against exp(x)",  # add title to graph                  
     :xlab => "x", :ylab => "exp(x)")     # add labels to axes                  
r.eval_R("dev.off()")       # finish the plotting