# File lib/backports/1.9.2/stdlib/matrix.rb, line 1335 def to_s if empty? "#{self.class}.empty(#{row_size}, #{column_size})" else "#{self.class}[" + @rows.collect{|row| "[" + row.collect{|e| e.to_s}.join(", ") + "]" }.join(", ")+"]" end end