Re: Placing the "&"
- To: mathgroup at smc.vnet.net
- Subject: [mg114795] Re: Placing the "&"
- From: Themis Matsoukas <tmatsoukas at me.com>
- Date: Fri, 17 Dec 2010 03:29:44 -0500 (EST)
Your code defines three functions, let's call them f1, f2 and f3. In all cases, & marks the end of the definition:
f1 = 2^(#) + 1 &
Select[Range[1000], f2 = PrimeQ[2^(#) + 1] &]
Select[Range[500], f3 = PrimeQ[FromDigits[Table[1, {#}]]] &]
2^#1 + 1 &
{1, 2, 4, 8, 16}
{2, 19, 23, 317}
As an example, let's evaluate these functions at x=1, 2, and 3:
{f1[1], f1[2], f1[3]}
{f2[1], f2[2], f2[3]}
{f3[1], f3[2], f3[3]}
{3, 5, 9}
{True, True, False}
{False, True, False}
Themis