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Re: Q: Extract Elements from a List?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28974] Re: [mg28968] Q: Extract Elements from a List?
  • From: Adriano Pascoletti <pascolet at dimi.uniud.it>
  • Date: Thu, 24 May 2001 04:06:51 -0400 (EDT)
  • References: <200105230554.BAA01361@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Robert,

use Take[list, {start, Length[list], step}]:

In[9]:=
list={a,b,c,d,e,f,g,h,i,j}
start=3;
step=2;
Take[list,{start,Length[list],step}]

Out[9]=
{a,b,c,d,e,f,g,h,i,j}

Out[12]=
{c,e,g,i}


Adriano Pascoletti


At 1:54 -0400 23-05-2001, Robert Schuerhuber wrote:
>Date: Wed, 23 May 2001 01:54:33 -0400 (EDT)
>From: Robert Schuerhuber <robert.schuerhuber at gmx.at>
To: mathgroup at smc.vnet.net
>To: mathgroup at smc.vnet.net
>Subject: [mg28974] [mg28968] Q: Extract Elements from a List?
>Organization: Vienna University of Technology
>
>hi!
>
>probably a very easy question, but i couldn't find an answer in the
>mathematica-book:
>
>i need to extract elements from a list, starting th element number x and
>than taking every yth element, eg:
>
>with
>
>list={a,b,c,d,e,f,g,h,i,j}
>start=3;
>step=2:
>
>i'd like to get the list
>
>{c,e,g,i}.
>
>how can i do this in the easiest way?
>
>regards, robert
>



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