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Re: Function changes in a program

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92305] Re: Function changes in a program
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sat, 27 Sep 2008 06:50:01 -0400 (EDT)
  • Organization: University of Bergen
  • References: <gbfloa$68a$1@smc.vnet.net>

Chris Degnen wrote:
> Hi
> 
> Does anyone have a suggestion on how to
> check for changes in environment function
> variables in a program. I.e. starting with ...
> 
> initial environment
> 
> f[a]=1
> f[b]=2
> 
> 
> later environment
> 
> f[a]=1
> f[b]=99
> f[m]=3
> 
> I'd like to be able to determine that
> f[b] had changed and f[m] was added. 
> 

Take a look at DownValues and related functions.  They might prove 
helpful (depending on what is it exactly that you are trying to achieve).


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