Re: Distinquishing #'s in nested pure functions
- To: mathgroup at smc.vnet.net
- Subject: [mg126278] Re: Distinquishing #'s in nested pure functions
- From: David Reiss <dbreiss at gmail.com>
- Date: Sat, 28 Apr 2012 05:27:53 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <201204260933.FAA05752@smc.vnet.net> <jndtj1$jit$1@smc.vnet.net>
For situations like this I always use explicit calls to Function[...],
though for the innermost our function I may use the shorthand #, &
form. In addition to avoiding potential ambiguities, it makes the
code readable.
--David
On Apr 27, 6:49 am, "Dave Snead" <dsne... at charter.net> wrote:
> Hi,
>
> Is there a way to distinguish the #'s in nested pure functions?
>
> As a simple example:
>
> f[x_, y_] := x - y
>
> Select[{1, 2, 3}, (f[#, #] & /@ {-1, -2, -3}) == {3, 4, 5} &]
>
> I want the 1st # to correspond with the outer & (the equal)
> and the 2nd # with the inner & (the map)
> The answer in this example should by {2}
> (of course, the statement as written above does not do the job)
>
> Can Mathematica distinguish these #'s?
>
> Thanks in advance,
> Dave Snead
- References:
- NonlinearModelFit and Complex Data
- From: Maria <rouelli@gmail.com>
- NonlinearModelFit and Complex Data