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MathGroup Archive 2005

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Re: multiple choice IF condition

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56449] Re: multiple choice IF condition
  • From: dh <dh at metrohm.ch>
  • Date: Tue, 26 Apr 2005 01:32:49 -0400 (EDT)
  • References: <d4hvhj$1ha$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Mark,
you may test if the variable i is in a given list like:

MemberQ[{3,5,9,18},i]

Further, "Do" is more appropriate than "Table" for your purpose, because 
you do not want to create a table but only the  side effect.
with this:
Do[If[MemberQ[{3,5,9,18},i], a = a + i], {i, 20}]

Sincerely, Daniel


marloo3 at mail15.com wrote:
> could we have a more practical way than this way of choosing some numbers of the 
> choice:
> 
> a = 0;
> Table[If[i == 3 || i == 5 || i == 9 || i==18, a = a + i], {i, 20}]
> 
> ie: i wish if it is possible like this:
> If[i==3 ||5 ||9||18, ...]
> 
> Thanks very much
> mark
> 


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