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MathGroup Archive 1999

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Evaluate/Module

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16061] Evaluate/Module
  • From: Bernd Brandt <bernd at bio.vu.nl>
  • Date: Tue, 23 Feb 1999 03:45:18 -0500
  • Organization: VU Biology, Amsterdam, The Netherlands
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

I'm having some trouble with Evaluate and i cannot find this in the
documentation.
Does anybody know what and esp. why the following is happening?

		In1:= tmp = x^2 +1; 

		In2:= Module[{x=4},tmp=tmp-1;Print[tmp]; Evaluate[tmp]]

		x^2
		x^2 + 1

In the above Evaluate[tmp] somehow takes the latest value of tmp and not
the current one after the "tmp=tmp-1". Why?

Changing "Evaluate[tmp] to "l=Evaluate[tmp]" does give the right answer
(in this case x^2) immediately. Does this assignment force Evaluate to
Evaluate tmp before ending the Module. Does someone know more about
Evaluate and Modelule?

		lM[x0_]:= Module[{lonediff,lMdiff,ldead,lone,search},
		lonediff= 1 + lone/2 - x0/lone - 2 / (1 + Exp[2*ldead - 2*lone]);
		lMdiff = (2*(x0/(1+x0) )*E^(-ldead+ lone))/(E^(2*lone-2*ldead)+1)-
0.1;	
		search=FindRoot[{lMdiff==0, lonediff==0 },{ldead,x0+1} ,{lone,x0}];    
		Evaluate[ldead /. search]
		];		

		lM[6]	

		ReplaceAll::"reps": 
	  	  {search$77} is neither a list of replacement rules nor a valid
		dispatch table, and so cannot be used for replacing."

		5.44865

In this module Evaluate somehow is looking for an global "search"
variable.
Why does it not just evaluate this local "search"?

Thanks,

Bernd


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