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Re: Automatic update of variables

  • To: mathgroup at smc.vnet.net
  • Subject: [mg110321] Re: Automatic update of variables
  • From: Peter Pein <petsie at dordos.net>
  • Date: Sun, 13 Jun 2010 04:10:57 -0400 (EDT)
  • References: <huvk4q$rq0$1@smc.vnet.net>

Am Sat, 12 Jun 2010 09:31:06 +0000 (UTC)
schrieb Antonio De Ju=E1rez <adejuarez at gmail.com>:

> Sometimes, I would find useful a method to update variables
> automatically. For example, given the delayed rule
>
> b:=3 a+1;
>
> it would be useful to have b updated whenever a is assigned a new
> value, like a=37. Is there any method to do this in Mathematica?
>
> Thanks,
>
>    Antonio.
>
>

Hi Antonio,

I'm afraid I do not understand your problem:

In[1]:= b:=3 a+1;
In[2]:= b
Out[2]= 1+3 a
In[3]:= a:=123
In[4]:= b
Out[4]= 370

As you see, b changes its value as a does.




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