Re: Variables within With statement
- To: mathgroup at smc.vnet.net
- Subject: [mg123813] Re: Variables within With statement
- From: Szabolcs <szhorvat at gmail.com>
- Date: Tue, 20 Dec 2011 03:06:05 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <jccg39$mb4$1@smc.vnet.net> <jchh07$i99$1@smc.vnet.net>
- Reply-to: comp.soft-sys.math.mathematica at googlegroups.com
On Saturday, 17 December 2011 08:39:51 UTC+1, markholtuk wrote:
> You could try delaying assignment of a, as follows:
>
> In[1]:= With[{a := a = 5, b = 10 a}, a + b]
>
> Out[1]= 55
>
Please note that this solution modifies the global variable 'a', and therefore defeats the purpose of With (which is defining *local* constants).
The original question is a good one, I often wish for such a functionality too (and it's no coincidence that so many custom implementations can be found all over the web).