Re: What is a good way of returning a function from a Module[]?
- To: mathgroup at smc.vnet.net
- Subject: [mg83387] Re: [mg83287] What is a good way of returning a function from a Module[]?
- From: DrMajorBob <drmajorbob at bigfoot.com>
- Date: Mon, 19 Nov 2007 06:12:56 -0500 (EST)
- References: <27565761.1195340077377.JavaMail.root@m35>
- Reply-to: drmajorbob at bigfoot.com
Module[{a, b}, a = 1; b = a + 1; Function[{c}, Evaluate[a + b + c]]]
Function[{c$}, 3 + c$]
Bobby
On Sat, 17 Nov 2007 04:10:37 -0600, Szabolcs Horvát <szhorvat at gmail.com>
wrote:
> What is an elegant way of returning a function from a Module[]?
>
> Module[{a, b}, a = 1; b = a+1; (a+b+#)&] does not work because
> Function[] holds its arguments.
>
> The best way I could find was
>
> Module[{p, q}, p = 1; q = p+1; With[{a = p, b = q}, (a+b+#)&]]
>
> Is there a nicer/more concise way of doing this? This is a simplified
> example, but the important points are:
>
> 1. The returned function may depend on more than one parameter ('a' and
> 'b'; let's forget that in this case their sum could have been computed
> inside the Module[]).
>
> 2. 'a' and 'b' are not calculated independently. The value of 'a' is
> needed to find 'b'
>
> Szabolcs
>
>
--
DrMajorBob at bigfoot.com