counting values on one colum only

I was able to figure it out. I used  
daysSamp<- na.omit(weekly)
 daysSamp<- nrow(daysSamp)
 daysSamp
4
I ommited the NA's and then counted the number of
rows. Thanks for your time Mark
I'm not an R expert but if you show me the
str(weekly) output, i think I can answer your
question.

Mark:
I basically need to count the number of rows that
have
values only. I tried your example and it crashed.I
have been reading and looking for a function that
does
that but no luck...

--- markleeds at verizon.net wrote:

From: Felipe Carrillo <mazatlanmexico at yahoo.com>
Date: 2008/03/22 Sat PM 06:16:59 CDT
To: r-help at stat.math.ethz.ch
Subject: [R] counting values on one colum only
i'm not sure i understand what you want
because, by definition,
a dataframe can't have a different
number of rows in each column ?
maybe  

i<-nrow(!is.na(weekly$a)) 

if the blanks are actually NAs ?

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

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Felipe D. Carrillo
 Fishery Biologist
 Department of the Interior
 US Fish & Wildlife Service
 California, USA

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Felipe D. Carrillo
  Fishery Biologist
  Department of the Interior
  US Fish & Wildlife Service
  California, USA