Re: What's this Mathematica function called?

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg965] Re: What's this Mathematica function called?*From*: rubin at msu.edu (Paul A. Rubin)*Date*: Thu, 4 May 1995 04:14:19 -0400*Organization*: Michigan State University

In article <3npou7$od2 at news0.cybernetics.net>, martind at carleton.edu (D<martind at carleton.edu>M) wrote: ->First let me apologize for what I'm pretty certain is a question that I could ->find if only I searched through the big black book long enough. However, I am ->unable to find an answer anywhere in the index, so I'll ask it here. -> ->What is Mathematica function that determines if one expression depends on ->another? i.e. if this function were called Depends, it would give output ->something like this: -> ->Depends[x + 3, x] ->==> True ->Depends[y, x] ->==> False ->y := x^2 ->Depends[y, x] ->==> True ->Depends[f[g[x]], x] ->==> True ->Depends[f[g[y]], x] ->==> True ->Clear[y]; Depends[f[g[y]], x] ->==> False -> ->I seem to remember running across it at some point, but I'm unable to find it ->now... -> ->Daniel Martin ->martind at carleton.edu I think you want FreeQ. Paul ************************************************************************** * Paul A. Rubin Phone: (517) 432-3509 * * Department of Management Fax: (517) 432-1111 * * Eli Broad Graduate School of Management Net: RUBIN at MSU.EDU * * Michigan State University * * East Lansing, MI 48824-1122 (USA) * ************************************************************************** Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. J. W. v. GOETHE