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Re: HELP: How to do count to the SUB-LIST

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82156] Re: HELP: How to do count to the SUB-LIST
  • From: tomfabtastic at hotmail.com
  • Date: Sat, 13 Oct 2007 03:57:34 -0400 (EDT)
  • References: <fen5th$4ho$1@smc.vnet.net>

On Oct 12, 4:57 pm, zhen <wangzhen0... at gmail.com> wrote:
> Hallo, everyone
>
> I am new to Mathematica, and I get one problem now, hope to get some
> help here
>
> I got a list like this:
>
> {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 1, 1, 0, 0, 0, 1, 0, 0, 0},
> {0, 0, 0, 0, 1, 1, 0, 0, 2, 0}, {1, 0, 1, 0, 0, 1, 0, 1, 0, 0},
> {1, 3, 3, 4, 2, 2, 5, 3, 2, 1}, {7, 2, 2, 3, 4, 4, 0, 3, 1, 3}}
>
> I need to get a list to show the number of non zero number in each sub
> list, as to say, I need to get a list like this:
>
> {0,3,3,4,10,9}
>
> Thanks alot!

Hi Zhen,

The below works :

matrixM = {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 1, 1, 0, 0, 0, 1, 0, 0,
     0}, {0, 0, 0, 0, 1, 1, 0, 0, 2, 0}, {1, 0, 1, 0, 0, 1, 0, 1, 0,
    0}, {1, 3, 3, 4, 2, 2, 5, 3, 2, 1}, {7, 2, 2, 3, 4, 4, 0, 3, 1,
    3}};
Table[Count[sd[[g]], _?(# != 0. &)], {g, 1, Length[matrixM]}]

Tom.



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