Re: Re: Just another bug in MMA 3.0

*To*: mathgroup at smc.vnet.net*Subject*: [mg7520] Re: [mg7491] Re: [mg7431] Just another bug in MMA 3.0*From*: Paulo Mouat <mouat at mail.telepac.pt>*Date*: Tue, 10 Jun 1997 23:17:53 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Kai Koehler wrote: > E.g. what do you think about the following quite serious bug, which I > mailed Wolfram support on april 4th: > > Sum[Sum[Log[Log[k+j]],{k,1,n}],{j,1,5}] > > gives > > 5*Sum[Log[Log[k + j]], {k, 1, n}]. > > Many other people verified this bug on various machines. If you want to do a multiple sum, the input should read Sum[Log[Log[k+j]],{k,1,n},{j,1,5}] What you have typed is a simple sum over k with a function that has an unknown j. The j on the outer Sum is a dummy variable, with no relation to the one in Log[k+j]. This is not a bug. Mathematica simply interpreted what you did type, which is not quite what you intended to do. Regards. -- __|__ ___\_/___ Paulo Mouat, ___ mouat at mail.telepac.pt |___| http://www.geocities.com/Vienna/8804/ |___| http://www.trailerpark.com/waltz/mouat/