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MathGroup Archive 2007

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RE: Variable containing code

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74978] RE: [mg74937] Variable containing code
  • From: "Ingolf Dahl" <ingolf.dahl at telia.com>
  • Date: Fri, 13 Apr 2007 02:05:58 -0400 (EDT)
  • Organization: Goteborg University
  • References: <200704120847.EAA24473@smc.vnet.net> <001301c77ceb$d0454d70$70cfe850$@dahl@telia.com> <461E09C2.7020003@metrohm.ch>
  • Reply-to: <ingolf.dahl at telia.com>

Hi Daniel,
The easiest way I could come up with fast is this:

Use t1[1] instead of t1:

t1[1]:= Print["Hello"]

Use a storage variable:

store = DownValues[t1];

Put then 

t2 := store[[1, 2]]

Then you could change t1, and t2 will anyway print "Hello" each time you
evaluate it.

There are probably better ways.

Best regards

Ingolf Dahl

-----Original Message-----
From: Daniel Huber [mailto:dh at metrohm.ch] 
Sent: 12 April 2007 12:28
To: ingolf.dahl at telia.com
Subject: [mg74978] Re: [mg74937] Variable containing code

Hi Ingolf,
unfortunately life is not so easy. t2:=t1 reevaluates t1 each time  t2 
is used. If t1 is changing in between t2 is changed too. What is looked 
for, is a way to get the value of t1 into the definition of t2 without 
evaluating it.
Daniel

Ingolf Dahl wrote:
> Maybe you could try with
>
> t2 := t1;
>
> or am I missing something?
>
> Best regards
>
> Ingolf Dahl
> Sweden
>
> -----Original Message-----
> From: dh [mailto:dh at metrohm.ch] 
> Sent: 12 April 2007 10:47
> To: mathgroup at smc.vnet.net
> Subject: [mg74937] Variable containing code
>
>
>
> Hello,
>
> how can one get at the value of a variable if this value is executable 
>
> code? E.g. consider variable t1:= Print["Hello"]. How can I set the 
>
> value of a second variable t2 to the value of t1 without executing the
code?
>
> Daniel
>
>
>
>
>
>
>
>   


-- 

Daniel Huber
Metrohm Ltd.
Oberdorfstr. 68
CH-9100 Herisau
Tel. +41 71 353 8585, Fax +41 71 353 8907
E-Mail:<mailto:dh at metrohm.ch>
Internet:<http://www.metrohm.ch>





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