Groups > comp.soft-sys.math.mathematica > #2780

Pure functions and Select[] sequential elements of list

From	"McHale, Paul" <Paul.McHale@excelitas.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Pure functions and Select[] sequential elements of list
Date	2011-05-29 11:38 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<irtb73$plj$1@smc.vnet.net> (permalink)

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Hi,

Does anyone know of a way to use a pure function to access current and next element of list with uses like Select[]?  I know I might be dazed and confused, but I thought there was a way.  I.e.

mList={1,2,3,4,5,7,6,8};
Select[mList, (#? > #??)&]

Where #? Is element N and #?? Is element N+1.  I would expect the previous code (assuming N?, N?? were valid) to return 7.

Maybe there is no way to do this with a pure function.  I know there are many other ways.  This would be one more way to not require a looping construct to resolve this.  If someone knows of straightforward ways other than Table[] or For[], Do[]... looping contructs, I would appreciate it the general knowledge.  I constantly struggle against my C language beginning ;)

Best Regards,
Paul


Paul McHale  |  Electrical Engineer, Energetics Systems  |  Excelitas Technologies Corp.

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Paul.McHale@Excelitas.com<mailto:Paul.McHale@perkinelmer.com>
www.excelitas.com<http://www.excelitas.com>

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Pure functions and Select[] sequential elements of list "McHale, Paul" <Paul.McHale@excelitas.com> - 2011-05-29 11:38 +0000
  Re: Pure functions and Select[] sequential elements of list Ray Koopman <koopman@sfu.ca> - 2011-05-30 10:33 +0000
  Re: Pure functions and Select[] sequential elements of list "Chris Degnen" <degnen@cwgsy.net> - 2011-05-30 10:35 +0000

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