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MathGroup Archive 2006

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Re: Mapping Functions That Take More Than One Argument

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69884] Re: [mg69864] Mapping Functions That Take More Than One Argument
  • From: Adriano Pascoletti <pascolet at dimi.uniud.it>
  • Date: Tue, 26 Sep 2006 05:21:36 -0400 (EDT)
  • References: <200609260459.AAA01823@smc.vnet.net>

Gregory,

look for Map in the help browser.

Map[Rest,{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}]
or
Map[Drop[#,1]&,{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}]
give what you want

Adriano Pascoletti


On 26 set 2006, at 06:59, Gregory Lypny wrote:

> Hello everyone,
>
> How can I map a functions onto sub-lists when the function takes more
> than one argument.  I can't seem to stumble upon the right syntax.
>
> Here's a list of three sub-lists.
>
> {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}
>
> I want to drop the first element of each sub-list, that is, 1 from
> the first, 4 from the second, and 7 from the third.
>
> Drop[{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}, 1]
>
> gives me
>
> {{4, 5, 6}, {7, 8, 9}},
>
> which is what I expected (I'm learning) but not what I want.  So, how
> do I apply Drop to each sub-list?
>
> Regards,
>
> 	Gregory
>


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