Thank you all for your responses.  I have a second part question.  I 
still cannot get the array.each do || correct, so I have been having to 
use these long and unsophisticated while loops:

-------------------------------------
n = 0
elements = []
while n != reference1.length
  x = 
REXML::XPath.match(doc,"//*[@id='#{reference2[n]}']/Coordinates/IfcLengthMeasure").map 
{|element| element.text}
  elements << x
  n=n+1
end

n = 0
result = []
while n != elements.length
  a = 0
    while a != elements[n].length
      x = elements[n][a].to_f
      result << x
      a = a+1
    end
  n=n+1
end
------------------------------------

Any ideas on how to make these more concise by using .each?  I have been 
trying many different things but cannot make it work.  Thank you for 
your time.

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