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Re: Re: Changing the head of the elements of an Imported list

• To: mathgroup at smc.vnet.net
• Subject: [mg40704] Re: [mg40674] Re: [mg40650] Changing the head of the elements of an Imported list
• From: Dr Bob <majort at cox-internet.com>
• Date: Mon, 14 Apr 2003 04:03:18 -0400 (EDT)
• References: <200304120709.DAA21282@smc.vnet.net> <200304130617.CAA27314@smc.vnet.net>
• Reply-to: majort at cox-internet.com
• Sender: owner-wri-mathgroup at wolfram.com

>> Apply[Cuboid, expr];
 
Would that work in this case?
 
expr="Cuboid[{3,3,3}]";

Apply[Cuboid,expr]
%//FullForm

Cuboid[{3,3,3}]
"Cuboid[{3,3,3}]"
 
I guess not.  It's still a string.
 
expr // ToExpression
% // FullForm
 
Cuboid[{3,3,3}]
Cuboid[List[3,3,3]]
 
Much better.
 
Bobby
 
On Sun, 13 Apr 2003 02:17:31 -0400 (EDT), Hermann Schmitt 
<schmitther at netcologne.de> wrote:

> Hello,
> Apply[Cuboid, expr];
> Hermann Schmitt
> ----- Original Message ----- From: "feleki" <feleki at hbt.arch.ethz.ch>
To: mathgroup at smc.vnet.net
> To: mathgroup at smc.vnet.net
> Subject: [mg40704] [mg40674] [mg40650] Changing the head of the elements of an 
> Imported list
>
>
>>
>> Hello Mathgroup!
>>
>> I have a problem:
>>
>> I need a list of Cuboids to be represented with the
>> Graphics3D procedure.
>> I would like to import this list of Cuboids from
>> a text file generated by another program, the text file looks like:
>>
>> Cuboid[{3,3,3}]
>> Cuboid[{3,1,3}]
>> Cuboid[{3,2,3}]
>> Cuboid[{1,3,1}]
>>
>>
>> and so on...
>>
>> The problem is however that after importing
>> the text file into a list in Mathematica, all the elements
>> of the list have the head String while the
>> Graphics3D requires them to have the head of Cuboid.
>>
>> Is it possible to change the head of the
>> elements of this list from Sting to Cuboid?
>>
>> Best regards,
>> Zsolt Feleki
>> Phd Student
>> Chair of Building Physics
>> ETH H=F6nggerberg HIL E46.1, 8093 Z=FCrich
>> Tel: 01-633 28 77/ 633 36 32
>> Fax: 01-633 10 41
>> http://www.bph.hbt.arch.ethz.ch
>>
>>
>
>
>



-- 
majort at cox-internet.com
Bobby R. Treat

• References:
  • Changing the head of the elements of an Imported list
    • From: feleki <feleki@hbt.arch.ethz.ch>
  • Re: Changing the head of the elements of an Imported list
    • From: "Hermann Schmitt" <schmitther@netcologne.de>