Re: Mapping a scalar against a list
- To: mathgroup at smc.vnet.net
- Subject: [mg28404] Re: [mg28393] Mapping a scalar against a list
- From: BobHanlon at aol.com
- Date: Mon, 16 Apr 2001 03:28:57 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
M is Outer
Outer[f, {a}, {b, c, d}]
{{f[a, b], f[a, c], f[a, d]}}
Bob Hanlon
In a message dated 2001/4/15 3:40:55 AM, mcoleman at bondspace.com writes:
>I've recently been working on a problem involving determining whether a
>given string is contained in a large list of strings. Ideally, the problem
>would be solved by a 'Map' function 'M' defined as
>
>M[f,{a,{b,c,d,...}}]= {f[a,b],f[a,c],f[a,d],...}
>
>For this particular problem, {a} is a stiring, and {b,c,d,...} is a list
>of
>strings, then f=StringMatchQ. The function 'M' does not appear to match
>up
>against the standard Mathematica list functions. My current solution is
>to 'expand'
>the list {a} into a list of size Dimension[{b,c,d,...}] and then use
>MapThread. But this does not seem particularly elegant, especially if the
>list is very large.
>