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

• To: mathgroup at smc.vnet.net
• Subject: [mg33764] RE: [mg33728] How to Return from within a Table[]-Command?
• From: "David Park" <djmp at earthlink.net>
• Date: Thu, 11 Apr 2002 02:14:33 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Detlef,

Use Throw and Catch.

Divide2[L_List] :=
Catch[Module[{newlist},
newlist =
Table[
If[IntegerQ[L[[i]]],
i/2,
Throw["vector not valid."];
]
, {i, 1, Length[L]}
];
newlist
]]

Divide2[{2, 3, a}]
"vector not valid."

Divide2[{2, 3, 4.5}]
"vector not valid."

Divide2[{2, 3, 4}]
{1/2, 1, 3/2}

David Park

> From: Detlef Mueller [mailto:dmueller at mathematik.uni-kassel.de]
To: mathgroup at smc.vnet.net
>
>
> 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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