Re: Help with Hold
- To: mathgroup at smc.vnet.net
- Subject: [mg100934] Re: Help with Hold
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 18 Jun 2009 06:18:39 -0400 (EDT)
- Organization: Uni Leipzig
- References: <h1cv8s$jfg$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi,
(Hold[x, Null, y, Null, Null] /.
a_Symbol /; FreeQ[Names["System`*"], ToString[Unevaluated[a]]] :>
ToString[Unevaluated[a]]) /. Hold -> List
?
Regards
Jens
Erich Neuwirth wrote:
> How can I transform
> Hold[x,Null,y,Null,Null]
> into
> {"x",Null,"y",Null,Null}
> even if x and/or y have assigned values?
>