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

*To*: mathgroup at smc.vnet.net*Subject*: [mg122243] Re: count the number of sub-list in a list*From*: Shizu <slivo.vitz at msa.hinet.net>*Date*: Sat, 22 Oct 2011 06:06:32 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

To find all the elements you need, use Position[list, {{_, _, _}, {_, _, _}, {_, _, _}}] So, you see the elements are all at level 2, since each element has 2 indices. Count[list, _List, {2}] will give you the number of elements. Or else, you would say, Count[list, {{_, _, _}, {_, _, _}, {_, _, _}}, Infinity] This also gives the result, but you don't need to know the position/level of your elements. If you type TreeForm[list], you'll see the "shape" of your list. And figure out how to count them.