Re: Re: Converting an expression to a list of terms?

*To*: mathgroup at smc.vnet.net*Subject*: [mg71743] Re: [mg71555] Re: Converting an expression to a list of terms?*From*: János <janos.lobb at yale.edu>*Date*: Tue, 28 Nov 2006 06:03:56 -0500 (EST)*References*: <200611200743.CAA09240@smc.vnet.net><ejtdhl$j0v$1@smc.vnet.net> <200611231041.FAA25205@smc.vnet.net>

Dimitris, I had my disclaimer: "newbie approach" as a red flag. That is a clear indication that it is by the grace of god that I am able to present a solution and that solution is good just for me. Good programming technique should come from member emeritizeuses of this group. I am just an accidental stalker here nothing more. I read Chapter 2 from the Book. As a matter of fact I read it multiple times. I have to confess that even if I would have the time to read it ab infinity, I still would not get more out of it than I have as it is. Steven just did not sex it up to get me more exited about it :) With the best, János On Nov 23, 2006, at 5:41 AM, dimitris wrote: > It's not a good programming practise to treat independently each > element of one expression. > Treat the expession as a whole. > > lst=a+b-c+d-e; > > List@@lst > > {a,b,-c,d,-e} > > lst/.x_+y___\[RuleDelayed]{x,y} > > {a,b,-c,d,-e} > > I highly recomend you reading Chapter 2 of the Mathematica Book. > > FrontEndExecute[{HelpBrowserLookup["MainBook", "2"]}] > > Regards > Dimitris > > János wrote: >> On Nov 20, 2006, at 2:43 AM, AES wrote: >> >>> How to convert an expression consisting of a sum of terms in an >>> Output >>> cell: >>> >>> A + B - C + . . . >>> >>> (where A, B, C are themselves product expressions) to a list >>> >>> {A, B, -C, . . . } >>> >>> in some easier fashion than doing it by hand using Find and Replace? >> >> My newbie approach would be: >> >> In[1]:= >> expr = a + b - c + d - e; >> >> In[2]:= >> Table[expr[[i]], >> {i, 1, Length[expr]}] >> Out[2]= >> {a, b, -c, d, -e} >> >> János >> >> >> ---------------------------------------------- >> Trying to argue with a politician is like lifting up the head of a >> corpse. >> (S. Lem: His Master Voice) ---------------------------------------------- Trying to argue with a politician is like lifting up the head of a corpse. (S. Lem: His Master Voice)

**References**:**Converting an expression to a list of terms?***From:*AES <siegman@stanford.edu>

**Re: Converting an expression to a list of terms?***From:*"dimitris" <dimmechan@yahoo.com>