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Re: Q: Extract Elements from a List?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28976] Re: [mg28968] Q: Extract Elements from a List?
  • From: maarten.vanderburgt at icos.be
  • Date: Thu, 24 May 2001 04:06:53 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Robert,

Something like this?

In[1]:= list = Range[15, 1, -1]
Out[1]= {15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1}

In[2]:= start = 5;
        step = 2;

In[3]:= Take[list, {start, Length[list], step}]
Out[3]= {11, 9, 7, 5, 3, 1}


Maarten van der Burgt






Robert Schuerhuber <robert.schuerhuber at gmx.at> on 23-05-2001 07:54:33 AM
cc:
Subject: [mg28976]  [mg28968] Q: Extract Elements from a List?


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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