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Re: count the number of sub-list in a list
Posted:
Oct 22, 2011 5:28 AM
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On Oct 21, 2:29 pm, Gy Peng <hitphy...@gmail.com> wrote:
> Dear All,
>
> I have a list like:
>
> {{{{-0.00201671, 0.87571, 0.482832}, {-0.839678,
> 0.260735, -0.476401}, {-0.543081, -0.406384,
> 0.734789}}, {{-0.87571, -0.00201671,
> 0.482832}, {-0.260735, -0.839678, -0.476401}, {0.406384, -0.543081,
> 0.734789}}, {{0.00201671, -0.87571,
> 0.482832}, {0.839678, -0.260735, -0.476401}, {0.543081, 0.406384,
> 0.734789}}, {{0.87571, 0.00201671, 0.482832}, {0.260735,
> 0.839678, -0.476401}, {-0.406384, 0.543081,
> 0.734789}}}, {{{0.839678, -0.260735, 0.476401}, {-0.00201671,
> 0.87571, 0.482832}, {-0.543081, -0.406384, 0.734789}}, {{0.260735,
> 0.839678, 0.476401}, {-0.87571, -0.00201671,
> 0.482832}, {0.406384, -0.543081, 0.734789}}, {{-0.839678,
> 0.260735, 0.476401}, {0.00201671, -0.87571, 0.482832}, {0.543081,
> 0.406384, 0.734789}}, {{-0.260735, -0.839678, 0.476401}, {0.87571,
> 0.00201671, 0.482832}, {-0.406384, 0.543081,
> 0.734789}}}, {{{0.00201671, -0.87571, -0.482832}, {0.839678, -0.260735,
> 0.476401}, {-0.543081, -0.406384, 0.734789}}, {{0.87571,
> 0.00201671, -0.482832}, {0.260735, 0.839678,
> 0.476401}, {0.406384, -0.543081, 0.734789}}, {{-0.00201671,
> 0.87571, -0.482832}, {-0.839678, 0.260735, 0.476401}, {0.543081,
> 0.406384,
> 0.734789}}, {{-0.87571, -0.00201671, -0.482832}, {-0.260735, -0.839678,
> 0.476401}, {-0.406384, 0.543081, 0.734789}}}, {{{-0.839678,
> 0.260735, -0.476401}, {0.00201671, -0.87571, -0.482832}, {-0.543081,
> -0.406384,
> 0.734789}}, {{-0.260735, -0.839678, -0.476401}, {0.87571,
> 0.00201671, -0.482832}, {0.406384, -0.543081,
> 0.734789}}, {{0.839678, -0.260735, -0.476401}, {-0.00201671,
> 0.87571, -0.482832}, {0.543081, 0.406384, 0.734789}}, {{0.260735,
> 0.839678, -0.476401}, {-0.87571, -0.00201671, -0.482832}, {-0.406384,
> 0.543081, 0.734789}}}}
>
> I consider each of {{*, *, *}, {*, *, *}, {*,*,*}} is one single element, so
> how could I count how many element in the whole list? Thank you very much!
>
> G
I must admit that I am not exactly sure what you want.
I guess something from the following will be helpful.
In[137]:=
lst = {{{{-0.00201671, 0.87571, 0.482832}, {-0.839678,
0.260735, -0.476401}, {-0.543081, -0.406384,
0.734789}}, {{-0.87571, -0.00201671,
0.482832}, {-0.260735, -0.839678, -0.476401}, {0.406384, \
-0.543081, 0.734789}}, {{0.00201671, -0.87571,
0.482832}, {0.839678, -0.260735, -0.476401}, {0.543081,
0.406384, 0.734789}}, {{0.87571, 0.00201671,
0.482832}, {0.260735, 0.839678, -0.476401}, {-0.406384,
0.543081, 0.734789}}}, {{{0.839678, -0.260735,
0.476401}, {-0.00201671, 0.87571,
0.482832}, {-0.543081, -0.406384, 0.734789}}, {{0.260735,
0.839678, 0.476401}, {-0.87571, -0.00201671,
0.482832}, {0.406384, -0.543081, 0.734789}}, {{-0.839678,
0.260735, 0.476401}, {0.00201671, -0.87571,
0.482832}, {0.543081, 0.406384,
0.734789}}, {{-0.260735, -0.839678, 0.476401}, {0.87571,
0.00201671, 0.482832}, {-0.406384, 0.543081,
0.734789}}}, {{{0.00201671, -0.87571, -0.482832}, {0.839678, \
-0.260735, 0.476401}, {-0.543081, -0.406384, 0.734789}}, {{0.87571,
0.00201671, -0.482832}, {0.260735, 0.839678,
0.476401}, {0.406384, -0.543081, 0.734789}}, {{-0.00201671,
0.87571, -0.482832}, {-0.839678, 0.260735, 0.476401}, {0.543081,
0.406384,
0.734789}}, {{-0.87571, -0.00201671, -0.482832}, {-0.260735, \
-0.839678, 0.476401}, {-0.406384, 0.543081, 0.734789}}}, {{{-0.839678,
0.260735, -0.476401}, {0.00201671, -0.87571, -0.482832}, \
{-0.543081, -0.406384,
0.734789}}, {{-0.260735, -0.839678, -0.476401}, {0.87571,
0.00201671, -0.482832}, {0.406384, -0.543081,
0.734789}}, {{0.839678, -0.260735, -0.476401}, {-0.00201671,
0.87571, -0.482832}, {0.543081, 0.406384,
0.734789}}, {{0.260735,
0.839678, -0.476401}, {-0.87571, -0.00201671, -0.482832}, \
{-0.406384, 0.543081, 0.734789}}}};
In[152]:= Length[lst]
Length /@ lst
Map[Length, lst, {2}]
Out[152]= 4
Out[153]= {4, 4, 4, 4}
Out[154]= {{3, 3, 3, 3}, {3, 3, 3, 3}, {3, 3, 3, 3}, {3, 3, 3, 3}}
Dimitris
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