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MathGroup Archive 2002

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Re: How to Return from within a Table[]-Command?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33753] Re: How to Return from within a Table[]-Command?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 11 Apr 2002 02:14:07 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <a90goo$kdb$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

a) use a pattern to restrict the argument

   Divide2[L:{__Integer}]:= 

b) Catch[] and Throw[] are for nonlocal returns

   Divide2[L_List] := Catch[
    Table[
      If[IntegerQ[L[[i]]], i/2, Throw[$Failed]], {i, 1, Length[L]}]
    ]

Regards
  Jens

Detlef Mueller wrote:
> 
> Hello,
> 
> I wanted to scan trough al List, building a new
> List, but aborting, if one Element of the first
> List violates a special Condition ...
> say for example:
> 
> Divide2[L_List] := Module[{},
>     Table[
>       If[IntegerQ[L[[i]]],
>         i/2,
>         Return["vector not valid."];
>         ]
>       , {i, 1, Length[L]}
>       ]
> 
>     ...
> 
>     ]
> 
> But this results:
> 
> In[13]:= Divide2[{2,3,a}]
> Out[13]= {1/2, 1, Return["vector not valid."]}
> 
> Wich is of course not what I want.
> 
> Greetings
> 
>   Detlef


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