[R] counting values on one colum only

[jim holtman]

There are 7 rows since this is probably a data frame and each column
in a dataframe (or a matrix in this case) all have the same number of
rows.  I think what you want is to 'sum' the number of times a
condition is met; this might come closer to what you were expecting:

sum(weekly$a != 0)

On Sat, Mar 22, 2008 at 6:16 PM, Felipe Carrillo
<mazatlanmexico at yahoo.com> wrote:
> Hi all:
> Can someone help me count the
> number of rows with values in
> colum "a" only. assume the name
> of my dataframe is "weekly"
> I was trying
> i<- nrows(weekly$a)
>  i
>  but returns 7 when it should
>  be 4. Thanks
> a       b       c     d
>                    27.000
>                    27.000
> 1.569   0.013   160.000 27.000
> 1.632   0.013   146.000 27.000
> 1.830   0.015   70.000  27.000
> 2.475   0.019   156.000 27.000
>                                      27.000
>
>  Felipe D. Carrillo
>  Fishery Biologist
>  Department of the Interior
>  US Fish & Wildlife Service
>  California, USA
>
>
>
>      ____________________________________________________________________________________
> Be a better friend, newshound, and
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?