Dynamically load a module from string

gistfile1.rb

#!/usr/bin/env ruby

lib_name   = 'matrix' # This could be your param
require lib_name      # require can accept a string

klass = Kernel.const_get(lib_name.capitalize) # Kernel.const_get turns a string into a constant
klass.zero(1) # And here we're using the newly constantized string to run methods on the Matrix class