def add_to_sum_row(value, column)
        return unless @sum_row_patterns
        @sum_row_patterns.each do |pattern|
          if pattern =~ /^\(?c\d+[=~+.]/
            header_column = evaluate(pattern, "")
          else
            header_column = pattern
          end

          if header_column == column
            @sum_row[header_column] ||= 0
            @sum_row[header_column] += value
          end
        end
      end
def add_to_sum_row(value, column)
        return unless @sum_row_patterns
        @sum_row_patterns.each do |pattern|
          if pattern =~ /^\(?c\d+[=~+.]/
            header_column = evaluate(pattern, "")
          else
            header_column = pattern
          end

          if header_column == column
            @sum_row[header_column] ||= 0
            @sum_row[header_column] += value
          end
        end
      end
Adds a value in the specified column to the sum_row