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MathGroup Archive 1996

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Re: operations with lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4107] Re: operations with lists
  • From: Harald Berndt <haraldb at nature.berkeley.edu>
  • Date: Tue, 4 Jun 1996 02:19:34 -0400
  • Organization: University of California Forest Products Lab
  • Sender: owner-wri-mathgroup at wolfram.com

Jonathan Lee wrote:
> 
> Hello,
> 
> I need help for three things:
> 
> 1) are there any tips for operating with large lists/matrices (in the
> order of 512*512 or so)
> 

MathLink to MatLab or C librraries, maybe?


> and
> 
> 2) is it possible to thread a compiled function over several lists.

One list at a time, you mean? That should be immediate. At the same 
time? Combine the lists in the appropriate way.

> 
> 3) is there any way to "intertwine" two lists?
> 
> i.e., if a and b are lists, is there a simple way to make a list that is
> {a[[1]], b[[1]],a[[2]],b[[2]],...}?
> 
> Thanks for any and all help.
> 

Flatten[ Transpose[{a, b}] ]

-- 
_______________________________________________________________
Harald Berndt                          University of California
Research Specialist                  Forest Products Laboratory
Phone: 510-215-4224                            FAX:510-215-4299
_______________________________________________________________



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