Hey guys! I''m relative new to Ruby on Rails, so I''m not sure how to solve following problem: Their are different ''families'', which have different values for attributes like ''lc1'' or ''ram1'' or so on... e.g. ( lc1 = [3,7, 8, 9,15] ...) My formula could look like this "3.0+lc1/log(ram1)". I calculated the log also before and saved the results also in an array, because I thought it could be used with the eval method. The problem is I''m not sure how to use it, because there could be also 7 attributes and 5 logs e.g. I don''t know how to make it dynamic according this needs. For this example, i would use: lc1 = lc1[i]; log(ram1) = log(ram1)[i]; eval("3.0+lc1/log(ram1)") I hope anybody can help me, because i couldn''t find much examples on this method. Thanks to any comment or suggestion! Regards Sabine -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.