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MathGroup Archive 2000

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Re: powersum with a function with variable count of parameters

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25272] Re: [mg25262] powersum with a function with variable count of parameters
  • From: BobHanlon at aol.com
  • Date: Sun, 17 Sep 2000 17:33:39 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 9/17/2000 4:54:35 AM, Klamser at t-online.de writes:

>how can I write a function f[x_,xi__]=10^x+10^xi, that returns
>f[1,2,3]->10^1+10^2+10 ^3.
>
>When i use the above definition, I only get
>
>10^1+10^2^3
>
>But I want to get
>
>10^1+10^2+10 ^3
>

f[x__] := Plus @@ (10^{x});

f[a]

10^a

f[a, b]

10^a + 10^b

f[a, b, c]

10^a + 10^b + 10^c


Bob Hanlon


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