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MathGroup Archive 2006

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Re: Interrogating lists of unequal lenghths

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67389] Re: [mg67367] Interrogating lists of unequal lenghths
  • From: ggroup at sarj.ca
  • Date: Wed, 21 Jun 2006 02:13:09 -0400 (EDT)
  • References: <200606200615.CAA15916@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Kevin,

The simplest is probably something like:
Length/@y
or,
Dimensions/@y

Good luck!

On Tue, 20 Jun 2006 02:15:02 -0400 (EDT), 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





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