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MathGroup Archive 2006

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Re: Interrogating lists of unequal lenghths

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67385] Re: Interrogating lists of unequal lenghths
  • From: Roger Bagula <rlbagula at sbcglobal.net>
  • Date: Wed, 21 Jun 2006 02:13:01 -0400 (EDT)
  • References: <e784k6$fq5$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

kevin_jazz wrote:

>I'm trying to understand how to assess the dimensions of a list
>containing elements of unequal length.
>Let's say I have the list with elements of equal sizes
>
>In[12]:=
>y={{1,2},{3,4},{5,6}}
>
>Out[12]=
>{{1,2},{3,4},{5,6}}
>
>In[13]:=
>Dimensions[y]
>
>Out[13]=
>{3,2}
>
>Using the Dimensions function I can determine the size of the resulting
>array. If, on the other hand, I set up the following list
>
>In[5]:=
>x={{1},{2,3},{4,5,6,7}}
>
>In[6]:=
>Dimensions[x]
>
>Out[6]=
>{3}
>
>The Dimensions command tells me I have only 3 elements.  But, I need
>some way to figure out that the first sublist has length 1, second has
>length 2, and the third has length 4 in some automated fashion. I've
>looked through the other commands like Depth and Length but I don't see
>anything that does this. 
>
>What's the right to do it? 
>
>Thanks,
>
>Kevin
>
>  
>

x={{1},{2,3},{4,5,6,7}}
Table[Length[x[[n]]], {n, 1, Length[x]}]


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