MathGroup Archive 2010

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

Search the Archive

Re: Placing the "&"

  • To: mathgroup at
  • Subject: [mg114857] Re: Placing the "&"
  • From: Themis Matsoukas <tmatsoukas at>
  • Date: Mon, 20 Dec 2010 00:41:23 -0500 (EST)


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


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?


  • Prev by Date: Re: Help For OpenCLFractalRender
  • Next by Date: Complete uninstall of Mathematica 6/7/8 on a Mac
  • Previous by thread: Re: Placing the "&"
  • Next by thread: Re: Placing the "&"