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MathGroup Archive 2002

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Re: How to pick all terms which have are multiplied with a factor, e.g., 2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35475] Re: [mg35463] How to pick all terms which have are multiplied with a factor, e.g., 2
  • From: Tomas Garza <tgarza01 at prodigy.net.mx>
  • Date: Sun, 14 Jul 2002 06:19:51 -0400 (EDT)
  • References: <200207130749.DAA08600@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Would this help?

In[1]:=
expr = 2*a*b^2*c^3 + 13*x*y*a*b + 2/d;

In[2]:=
Cases[expr, 2*_]
Out[2]=
{2*a*b^2*c^3, 2/d}


Tomas Garza
Mexico City
----- Original Message -----
From: "Matthias G. Imhof" <mgi at vt.edu>
To: mathgroup at smc.vnet.net
Subject: [mg35475] [mg35463] How to pick all terms which have are multiplied with a
factor, e.g., 2


> I would like to simplify a large symbolic summation. I know that terms
which
> are multiplied with a common integer factor can ultimately be combined and
> simplified.
>
> As an example: from the sum
>
> 2 a b^2 c^3 + 13 x y a b + 2 d^-1
>
> I would like to pick 2 a b^2 c^3 + 2 d^-1 to combine them; and similarly
for
> other common integer factors. I suspect that patterns would help, but I
did
> not manage to devise a correct one.
>
> Matthias
>
>



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