[Date Index] [Thread Index] [Author Index]

Re: Placing the "&"

• To: mathgroup at smc.vnet.net
• Subject: [mg114867] Re: Placing the "&"
• From: ziloo <ziloo_1 at yahoo.com>
• Date: Tue, 21 Dec 2010 00:17:28 -0500 (EST)
• References: <iemqaa$m9m$1@smc.vnet.net>

Yes...that answers my question.  Thank you ^_^ !

ziloo


On Dec 20, 8:41 am, Themis Matsoukas <tmatsou... at me.com> wrote:
> Ziloo,
>
> I am not sure what you mean by "once a pure function becomes an argument 
for another standard function [...]".  A pure function is the entire construct that includes # and ends with &. Maybe you are referring to the # as the pure function? That's only the placeholder for the dummy variable. For example, in
>
> PrimeQ[2^(#)+1]&
>
> the pure function is the entire line, not just the #. The above is equivalent to the standard function,
>
> f[x_]:= PrimeQ[2^(x)+1]
>
> Compare now PrimeQ[2^(#) + 1] &[2] and f[2]. They both evaluate the function at x=2 and give the same answer.
>
> Does this help?
>
> Themis