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MathGroup Archive 2007

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Re: Assign delayed but fixed value

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75200] Re: Assign delayed but fixed value
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Fri, 20 Apr 2007 00:39:01 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <f079pm$47d$1@smc.vnet.net>

zac 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

What about using SetDelayed rather than Set?

In[1]:=
var := Table[Random[Integer, {0, 3}], {param}];
param = 3;
var
var

Out[3]=
{1, 1, 2}

Out[4]=
{3, 1, 2}

Regards,
Jean-Marc


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