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MathGroup Archive 2001

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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.
>


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