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Re: Transformation Rules

  • To: mathgroup at smc.vnet.net
  • Subject: [mg119731] Re: Transformation Rules
  • From: Adriano Pascoletti <adriano.pascoletti at uniud.it>
  • Date: Sun, 19 Jun 2011 07:25:20 -0400 (EDT)
  • References: <201106181021.GAA15377@smc.vnet.net>

In[19]:= L = {22, 28, 21, 22, 18, 29, 15, 7, 29, 34, 38, 43, 21, 18, 32, 44,
35, 45, 0, 4};
m = -Infinity; L /. {x_Integer :> If[x > m, m = x, Sequence @@ {}]}
Out[20]= {22, 28, 29, 34, 38, 43, 44, 45}


Adriano Pascoletti



2011/6/18 Stefan Salanski <wutchamacallit27 at gmail.com>

> Hey everyone, I found a sort of intro/tutorial notebook on my hard
> drive that I must have downloaded a while ago.
> "ProgrammingFundamentals.nb". I am not sure of the source, though the
> author appears to be a Mr. Richard Gaylord.
>
> "These notes form the basis of a series of lectures given by the
> author, in which the fundamental principles underlying Mathematica's
> programming language are discussed and illustrated with carefully
> chosen examples. This is not a transcription of those lectures, but
> the note set was used to create a set of transparencies which
> Professor Gaylord showed and spoke about during his lectures. These
> notes formed the basis for both a single 6 hour one-day lecture and a
> series of four 90 minute lectures, delivered to professionals and to
> students."
>
> I sent it to a friend and recommended that he look through and try out
> some of the exercises to become more familiar with Mathematica. It was
> written in a previous version of Mathematica (dunno which, just not
> 8), but still has a lot of great exercises to try out. (the only real
> difference being the new implementation of RandomInteger and
> RandomReal instead of Random[Integer] and Random[Real])
>
> Anyway, I have gotten stumped on one of the Transformation Rule
> exercises which I have restated below:
>
>   Use a transformation rule to take a list of elements and return a
> list of those elements that are greater than all of the preceding
> elements in the list.
>
> How can this be done with transformation rules?
>
>


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