Re: simple set operations

*To*: mathgroup at smc.vnet.net*Subject*: [mg57653] Re: simple set operations*From*: David Bailey <dave at Remove_Thisdbailey.co.uk>*Date*: Fri, 3 Jun 2005 05:33:37 -0400 (EDT)*References*: <d7mk8b$c5m$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Edward Peschko wrote: > hey all, > > I'm hesitant to ask these questions (because they are so simple) but after a > 15 minute search through the docs I'm getting nowhere, so here goes: > > 1) what's the easiest way to generate a list of elements? ie: > > 'a' .. 'h' == { a,b,c,d,e,f,g,h } > > 2) Is there a quick way to check whether an element is in a set? > > if ('a' == (any('a','b','c','d')) { print "a is in a,b,c,d"; } > > The first one I see could possibly be done by 'Array', but I don't see how - > the '#' refers to the generation of numbers, but there seems to be no > corresponding 'letter' symbol. > > > As for #2, the easiest way would be through an overloading of the '==' operator, > but again, that doesn't seem to work.. > > Thanks much for any help, > > Ed > Hi Ed, Try CharacterRange["a","h"], if you really want to generate that particular list. There are also lots of other ways to generate lists - using Table, for example. Your second question can be solved using MemberQ. I think you may be making the mistake of trying to use Mathematica for a very specific task before you have mastered enough of it to get a feel for how it works. You do need to read the book and try the examples a bit before it clicks! David Bailey http://www.dbaileyconsultancy.co.uk