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 Author Comment/Response Bill Simpson 09/07/12 2:57pm In Response To 'Re: Re: Re: Re: Collecting terms in an expression'---------In[1]:= expr=Exp[a Fx[1]^2+a Fy[1]^2+a Fz[1]^2+b Fx[2]^2+b Fy[2]^2+b Fz[2]^2+c Fx[3]^2+c Fy[3]^2+c Fz[3]^2]; In[2]:= expr//.((_[n_]^2)..)->f[n]^2//._Integer*f_[i_]^2->f[i] Out[2]= E^(a*f[1] + b*f[2] + c*f[3]) There are other and perhaps even better ways of doing this, but there are always a dozen different ways of doing anything in Mathematica, at least several of which are completely incomprehensible. You have a huge amount of work to do. You can start by reading all the help pages on pattern matching. That will almost certainly not be enough. Then get yourself a couple of good books on Mathematica and read the chapters on pattern matching over and over. "Mathematica Navigator" is a good book to study. Even the previous edition which is available used and cheap would be ok to learn pattern matching, but other parts of Mathematica have changed and you would have to know how to deal with that. "The Mathematica Cookbook" is newer and would be a good second book to study. URL: ,

 Subject (listing for 'Collecting terms in an expression') Author Date Posted Collecting terms in an expression Sami 09/02/12 3:01pm Re: Collecting terms in an expression Bill Simpson 09/03/12 11:34pm Re: Re: Collecting terms in an expression Sami 09/04/12 12:48pm Re: Re: Re: Collecting terms in an expression Bill Simpson 09/04/12 10:29pm Re: Re: Re: Re: Collecting terms in an expression Sami 09/06/12 00:45am Re: Re: Re: Re: Re: Collecting terms in an expr... Bill Simpson 09/06/12 11:36am Re: Re: Re: Re: Collecting terms in an expression Sami 09/06/12 01:14am Re: Re: Re: Re: Re: Collecting terms in an expr... Bill Simpson 09/07/12 2:57pm Re: Re: Re: Re: Re: Re: Collecting terms in an ... Sami 09/08/12 03:26am Re: Re: Re: Re: Re: Re: Re: Collecting terms in... Sami 09/11/12 8:12pm Re: Re: Re: Re: Re: Re: Re: Re: Collecting term... Bill Simpson 09/14/12 03:31am
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