Map, List

*To*: mathgroup at smc.vnet.net*Subject*: [mg55066] Map, List*From*: Steve Gray <stevebg at adelphia.net>*Date*: Fri, 11 Mar 2005 04:20:42 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I wanted to convert {a,b,c} to {{a},{b},{c}}, (just an example) and it occured to me that since List[xx] = {xx}, I could do ml=Map[List,{a,b,c}] and get ml={{a},{b},{c}}, making List in this case the inverse of Flatten. Now,assuming a,b,c have appropriate integer values, I can do Delete[ggon, ml] where ggon is a list from which I want to delete an arbitrary set of list members. Of course this worked. My only problem is that I might not have thought of this obvious (in retrospect) operation. Using List as a function is not mentioned in any of my several books. What general principle applies that makes all such things functions? Thank you. Steve Gray

**Follow-Ups**:**Re: Map, List***From:*DrBob <drbob@bigfoot.com>

**Re: Map, List***From:*Chris Chiasson <chris.chiasson@gmail.com>