The [] method for the Gnuplot::Plot class fails when the variable being requested for does not exist in the @sets
array.


Gnuplot::Plot [] method

def [] ( var )
  v = @sets.assoc( var )
  v[1] || nil
end


'v' will be assigned 'nil' if 'var' is not found in @sets.  Then and undefined method `[]' error will be thrown when
v[1] is invoked since nil does not have a [] method.

Date: 2009-07-16 13:02
Sender: Roger Pack

if this is still a problem could you file an issue
at http://github.com/rogerdpack/ruby_gnuplot/tree/master ? (though
not the original creator, I'm going to upkeep a maintained branch
there).
Thanks