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MathGroup Archive 2001

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Re: Rearrangement of a sequence into random order

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28439] Re: Rearrangement of a sequence into random order
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Thu, 19 Apr 2001 03:26:27 -0400 (EDT)
  • References: <9bjg9m$gsn@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Loren,

Looking up RandomPermutation in the HelpBrowser , Master Index leads us to

<<DiscreteMath`Permutations`


RandomPermutation[20]

        {17,2,18,20,11,13,5,19,8,16,9,3,4,6,15,7,10,1,14,12}

And, more generally,

RP[x_]:=x[[RandomPermutation[Length[x]]]]

RP[H[a,b,c,d,e,f]]

        H[e,c,a,b,f,d]
--
Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

"Loren Dill" <lorendill at mediaone.net> wrote in message
news:9bjg9m$gsn at smc.vnet.net...
> Hi,
>
> I'm a math teacher, and need to prepare exams from time to time.  I
> typically prepare questions for the exam in a sequential order starting at
> the beginning of the material and going to the end.  I may have something
> like 20 short-answer questions.  I want a program that will randomize the
> order of the questions.  In other words, I want to provide n, the number
of
> questions, and have the program provide a list of length n that contains
all
> the numbers from 1 to n in a random order without any number being
repeated
> or omitted.  I'm sure that this is an easy task for Mathematica, but I
can't
> figure out the best way to do it.
>
> Loren Dill
>
>






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