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MathGroup Archive 2007

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Re: Assign delayed but fixed value

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75190] Re: [mg75168] Assign delayed but fixed value
  • From: "Chris Chiasson" <chris at chiasson.name>
  • Date: Fri, 20 Apr 2007 00:33:53 -0400 (EDT)
  • References: <200704190831.EAA04122@smc.vnet.net>

The way to do what you want is to make a delayed assignment to the
OwnValues of var that overwrites itself on execution.

(MMA 5.2 Kernel) In[1]:=
var:=var=Table[Random[Integer,{0,3}],{param}];
param=3;

(MMA 5.2 Kernel) In[3]:=
?var
Global`var
var:=var=Table[Random[Integer,{0,3}],{param}]

(MMA 5.2 Kernel) In[4]:=
var

(MMA 5.2 Kernel) Out[4]=
{0,0,0}

(MMA 5.2 Kernel) In[5]:=
?var
Global`var
var={0,0,0}

(MMA 5.2 Kernel) In[6]:=
var

(MMA 5.2 Kernel) Out[6]=
{0,0,0}

On 4/19/07, zac <replicatorzed at gmail.com> wrote:
> Dear Group!
>
> My target is to define the value of 'var' in terms of the value of
> 'param'. The problem is that 'param' is introduced later than 'var',
> and this time-sequence cannot be changed. However, I would like to
> create 'var' such a way that IF 'param' is known, the value of 'var'
> should be the same any time it is called.
> Example code:
>
> In[1]:=
> var = Table[Random[Integer,{0,3}],{param}];
> param = 3;
>
> >From In[1]:= Table::iterb : Iterator {param} does not have appropriate
> bounds. More...
>
> In[3]:=
> var
>
> Out[3]=
> {1,1,3}
>
> In[4]:=
> var
>
> Out[4]=
> {0,3,1}
>
>
> The Table::iterb message is a secondary matter, as the two 'var'
> outputs do not equal, and this is my primary concern. Any idea how to
> solve this task? Thanks in advance.
>
> Istvan
>
>
>


-- 
http://chris.chiasson.name/


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