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MathGroup Archive 2004

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Re: How to prevent from simplification?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52475] Re: How to prevent from simplification?
  • From: David Bailey <dave at Remove_Thisdbailey.co.uk>
  • Date: Sun, 28 Nov 2004 01:07:14 -0500 (EST)
  • References: <co98i8$h2k$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Christian Auner wrote:
> How can I substitute values into an expression and prevent it from
> beeing evaluated and simplified?
> 
> Assume I have an expression like
> 
> a + b/c 
> 
> and I want to substitute values for a,b and such that the result looks
> like
> 
> number + number
> 
> That is the evalution stops right before the addition.
> 
> I already tried HoldForm but it didn't work.
> 
Hi,

Well HoldForm certainly worked for me:

sss = HoldForm[a + b/c]

a+b/c

sss /. {a -> 7, b -> 4, c -> 2}

7+4/2

(I had to edit the output slightly because InputForm shows the HoldForm 
wrapper, and StandardForm displays the fractions with a vertical bar).

David Bailey


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