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MathGroup Archive 2000

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Re: Re: powersum with a function with variable count of parameters

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25304] Re: [mg25273] Re: [mg25262] powersum with a function with variable count of parameters
  • From: Otto Linsuain <linsuain+ at andrew.cmu.edu>
  • Date: Tue, 19 Sep 2000 03:45:29 -0400 (EDT)
  • References: <200009172133.RAA20770@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Excerpts from mail: 17-Sep-100 [mg25273] Re: [mg25262] pow.. by Richard
Palmer at bellatlan 
> Try PowerSum[args__]:=Plus@@{10^#&/@List[args])
> 
> The args parameter has two (2) underscores following it.  This permits 1 or
> more arguments.  List[args] turns the arguments into a list.  the function
> 10^# is mapped onto each element of the list (creating another list) and the
> elements of the list are finally summed.
> 
> Regards,  Richard Palmer
> 

 Richard, the function Power is Listable,

 10^# & /@ list  can therefore be abbreviated to 10^list

 Otto Linsuain. 


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