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).