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MathGroup Archive 1993

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Re: Differrence between version 2.03 and 2.1?

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Re: Differrence between version 2.03 and 2.1?
  • From: nachbar at merck.com
  • Date: Thu, 25 Feb 1993 13:04:58 -0500 (EST)

Leon Poon writes:
> 
> 	While I have your attention, I wonder if you know an
> easy way to turn the solutions of a Solve from a list of 
> replacement rules to simply elements of a list. Suppose
> Solve[x==f[x],{x}]={{x->a},{x->b},{x->c}}, I want the list
> {a,b,c} instead. I have come up with a cumbersome way of
> doing this which is
> solns=Table[x/.Flatten[solnlist=Solve[x==f[x],{x}]][[i]],
> 	{i,Length[solnlist]}]
> but I know there must be a better way.
> 

one can map Part over the list as in 

In[1]:= Solve[0==3 x^2 + 4 x -15, x]

                          5
Out[1]= {{x -> -3}, {x -> -}}
                          3

In[2]:= Part[#[[1]],2]& /@ %

             5
Out[2]= {-3, -}
             3

bob
-- 
Dr. Robert B. Nachbar | Merck Research Laboratories | 908/594-7795
nachbar at merck.com     | R50S-100                    | 908/594-4224 FAX
                      | PO Box 2000                 |
                      | Rahway, NJ 07065            |






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