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Re: Q: How to force an Equal[]

  • To: mathgroup at
  • Subject: [mg3359] Re: [mg3332] Q: How to force an Equal[]
  • From: brucec (Bruce Carpenter)
  • Date: Thu, 29 Feb 1996 03:26:16 -0500
  • Sender: owner-wri-mathgroup at

>Hi there,
>this should be a nice relaxing one. How can I force Mma to evaluate
>the equal expression, regardless of what values Word or Number
>stand for. I just want a false in the second case (y1==y2).
>x1={car, nose, 2334.34};
>x2={dummy, 3.1415, 8};
>y1=Map[Head,x1]//.{Symbol->Word,Integer->Number, Real->Number}
>y2=Map[Head,x2]//.{Symbol->Word,Integer->Number, Real->Number}
>y3=Map[Head,x3]//.{Symbol->Word,Integer->Number, Real->Number}
>{Word, Word, Number}
>{Word, Number, Number}
>{Word, Number, Number}
>Here we go:
>gives me as desired
>But this guy just returns the expressions:
>{Word, Word, Number} == {Word, Number, Number}
>I would like to see a False here.It works when I do
>{Symbol->"Word", ...}, converting it to Strings. But I wouldn't
>call that a nice style of writing inMma.
>Gerd Lanfermann
>840 N.Taylor
>St.Louis, Mo. 63122
>phone: (314) / 822 4518
>email: s997826 at          (University of Missouri, St.Louis)
>       lanfer at (Freie Universitaet Berlin)

I believe you want to use y1 === y2, which is the infix form of SameQ[y1, y2].

Bruce Carpenter


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