def create_operands(opts)
        files   = opts[:files].split(',')
        rlabels = opts[:rlabels].split(',').collect { |l| l.upcase == "TRUE" }
        clabels = opts[:clabels].split(',').collect { |l| l.upcase == "TRUE" }

        operands = {}
        opts[:aliases].split(',').each_with_index do |a,i|
          operands[a] = SpreadSheet.new(file: files[i], ds: opts[:ds], 
                                        equalize: opts[:equalize],
                                        r: rlabels[i], c: clabels[i])
        end

        operands
      end
def create_operands(opts)
        files   = opts[:files].split(',')
        rlabels = opts[:rlabels].split(',').collect { |l| l.upcase == "TRUE" }
        clabels = opts[:clabels].split(',').collect { |l| l.upcase == "TRUE" }

        operands = {}
        opts[:aliases].split(',').each_with_index do |a,i|
          operands[a] = SpreadSheet.new(file: files[i], ds: opts[:ds], 
                                        equalize: opts[:equalize],
                                        r: rlabels[i], c: clabels[i])
        end

        operands
      end
Creates the spread sheet operands for the arithmetic operation