Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: How to do count for sub list?????

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82138] Re: How to do count for sub list?????
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sat, 13 Oct 2007 03:48:18 -0400 (EDT)
  • References: <fen5rk$4gi$1@smc.vnet.net>

wangzhen0829 at gmail.com wrote:
> Hallo, everyone
> 
> I am new to Mathematica, and now I have a problem with it, hope to get
> some help from here.
> 
> I have a
> 
> {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {
>   0, 0, 0, 1, 0, 0, 0, 0, 0, 1}, {1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {
>   0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {
>   0, 0, 0, 0, 0, 0, 0, 0, 1, 0}, {0, 0, 0, 0, 1, 0, 0, 0, 0, 0}}
> 
> 
> 
> I need to get a list which represent the number of NON-zero number in
> each sublist.
> 
> I should get a list like:
> 
> {0,0,1,1,0,0,1,1}
> 
> Thank you!
> 
> 

In[5]:= (Count[1, x_ /; x != 0] & ) /@ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 1, 0, 0, 0, 0, 0, 1},
    {1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 1, 0},
    {0, 0, 0, 0, 1, 0, 0, 0, 0, 0}}

Out[5]= {0, 0, 2, 1, 0, 0, 1, 1}

The third list has two non-zero elements.

-- 
Szabolcs


  • Prev by Date: Re: HELP: How to do count to the SUB-LIST
  • Next by Date: Re: Unwanted resize of frontend window
  • Previous by thread: Re: Re: How to do count for sub list?????
  • Next by thread: Re: How to do count for sub list?????