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Re: Mapping Functions That Take More Than One Argument


On Sep 26, 2006, at 12:59 AM, 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

Here is two newbie approaches:

In[2]:=
Rest /@ lst
Out[2]=
{{2, 3}, {5, 6}, {8, 9}}

In[3]:=
(Take[#1, {2, Length[
       #1]}] & ) /@ lst
Out[3]=
{{2, 3}, {5, 6}, {8, 9}}

János


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