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Re: Recovering f[z] values?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg42707] Re: [mg42692] Recovering f[z] values?
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Tue, 22 Jul 2003 04:40:42 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200307210915.FAA08637@smc.vnet.net>
  • Reply-to: murray at math.umass.edu
  • Sender: owner-wri-mathgroup at wolfram.com

If you are using version 5, a simple way to do this is with Reap and 
Sow.  You'll need to restructure the list obtained as the second item in 
the resulting list so as to suit your purposes.

Here's an example:

   f[z_] := z^2
   Reap[Sow[z1 = 2]; Sow[f[z1]]; Sow[z2 = 3]; Sow[f[z2]]]
{9, {{2, 4, 3, 9}}}

AES/newspost wrote:
> During the course of a long notebook evaluation a certain function
> 
>     f[z] = some function of z
> 
> gets executed multiple times for various values of z which are no longer 
> remembered.  Near the end of the calculation it's desired to recover all 
> these values, perhaps in a list
> 
>     {{z1,f[z1]}, {z2,f[z2}, . . . }
> 
> Is there a simple way to do this?
> 
> 

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Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
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University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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