R help - Mar 2010 - Count of entries in a row of a data frame

Dear R-list,


I have data in the following format:

	Country 1 	Country 2	 Country 3 ...
1	0		1		 0	
2	1		0		 2
3	0		1		 0

Now I would like to create a variable that counts every non-zero element
of the rows, so for the above example it would be:

	Count
1	1
2	2
3	1

Any help from is greatly appreciated!

With kind regards
Thomas

Thomas -
    Two ways that come to mind are

apply(dat,1,function(x)sum(x != 0))

and

rowSums(dat!=0)

(assuming your data frame is named "dat").

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Thu, 18 Mar 2010, Thomas Jensen wrote:
> Dear R-list,
>
>
> I have data in the following format:
>
> 	Country 1 	Country 2	 Country 3 ...
> 1	0		1		 0
> 2	1		0		 2
> 3	0		1		 0
>
> Now I would like to create a variable that counts every non-zero element
> of the rows, so for the above example it would be:
>
> 	Count
> 1	1
> 2	2
> 3	1
>
> Any help from is greatly appreciated!
>
> With kind regards
> Thomas
>
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