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MathGroup Archive 2005

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Re: Zero-based indexing option?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61661] Re: [mg61621] Zero-based indexing option?
  • From: János <janos.lobb at yale.edu>
  • Date: Mon, 24 Oct 2005 21:07:23 -0400 (EDT)
  • References: <200510240544.BAA29061@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Oct 24, 2005, at 1:44 AM, Matt wrote:

> Hello,
>   I am a C/C++ developer by trade and zero-based indexing is the norm.
> When dealing with a set of objects, if I want to iterate over all of
> them for some reason or another, I'm used to doing something like  
> this:
>
> unsigned int ii(0);
> while (ii < elementCount)
> {
>   // do something
>   ++ii;
> }
>
> where elementCount represents the number of elements in a set of
> objects.  In Mathematica, I'm getting into the habit of doing  
> something
> like this:
>
> iterations = Length[(* of something *)] ;
> iterations++;
> ii = 1;
> While[ii <  iterations, (* do something *); ii++]

Map[#do_something&, of_something]

or if you prefer looping

Table[do_somthing[of_something[[i+1]] ],{i,0,Length[of_something]-1}]

János

>
> As you can see, I need to initialize my iterator to 1 and in order to
> keep strictly 'less than' semantics, I need to increase the size of my
> object set by one.  This is not a big deal, and if I have no other
> choice, I'll probably settle for setting the iterator to one and using
> 'less than or equal' semantics for the loop constraint so I'm not
> altering the size of the object set.
>
> However, it would be great if there were a Mathematica option or code
> driven setting that would allow me to use zero-based indexing.  Is
> there such a thing?
>
> Thanks,
>
> Matt

-------------------------------------------------
clear perl code is better than unclear awk code; but NOTHING comes  
close to unclear perl code
http://www.faqs.org/faqs/computer-lang/awk/faq/


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