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Re: count the number of sub-list in a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122248] Re: count the number of sub-list in a list
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Sat, 22 Oct 2011 06:07:26 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201110211128.HAA18658@smc.vnet.net>

Hi,

in your tensor m the elements you want to count have the Form {_Real, _Real, _Real}
and they are in the last level (-1) of your structure:

Count[m, {_Real, _Real, _Real}, -1]

or you just use the Dimension of m with the last level droped and multiply them

Times @@ Most@Dimensions[m]

both should give the same result.

Cheers
Patrick


On Oct 21, 2011, at 1:28 PM, Gy Peng 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
>




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