Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2010

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

Search the Archive

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


  • Prev by Date: Wolfram Library Archive - kaput?
  • Next by Date: Re: NMinimize::nrnum:
  • Previous by thread: Re: Placing the "&"
  • Next by thread: Re: Placing the "&"