Re: multiple choice IF condition
- To: mathgroup at smc.vnet.net
- Subject: [mg56467] Re: multiple choice IF condition
- From: Peter Pein <petsie at arcor.de>
- Date: Tue, 26 Apr 2005 01:33:46 -0400 (EDT)
- References: <d4hvhj$1ha$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
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
>
Hi Mark,
a = 0;
Table[Switch[i, 3 | 5 | 9 | 18, a += i, _, Null], {i, 20}]
produces the same Table
{Null, Null, 3, Null, 8, Null, Null, Null, 17, Null,
Null, Null, Null, Null, Null, Null, Null, 35, Null, Null}
as in your example.
--
Peter Pein
Berlin