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MathGroup Archive 2004

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Re: reuse values maximize

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51991] Re: reuse values maximize
  • From: David Bailey <dave at Remove_Thisdbailey.co.uk>
  • Date: Sat, 6 Nov 2004 02:08:28 -0500 (EST)
  • References: <cmfbkc$7eh$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Arne wrote:
> Sorry, very simple question, but I really can't work it out...
> 
> I want to use the output of a maximation for further calculations.
> something like:
> 
> z[y_]=-y^2+y
> a=Maximize[z,{y}]
> b=Extract[a,1]
> 
> Now mathematica returns {y -> -0.5}. 
> 
> I want to assign the value of -0.5 to a new variable. So far I haven't
> worked out how to do this (besides copy and paste!).
> 
> Thanks for any comment.
> 
Let us say you have the expression {y->-0.5} in a variable ans, then you 
could extract the value into another variable with:

othervar= y/.ans

What happens here is that the expression y/.ans means y with the 
substitutions contained in ans applied - which boils down to -0.5.

Regards,

David Bailey


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