R help - Apr 2005 - extracting selected rows, based on a 'list' of values

Hi,
 
I was trying to extract certain rows from a table. For example, if the value in
the first column is "a", "d", "k", or
"z", then I would like to extract these rows. In other words, if the
value in the column is also an element in my list (a,d,k,z), then I would like
to extract the row.
 
I've looked in the archives and the solutions I could find were restriced to
the value in the row name being a single element.
 
thanks for the help,
 
Tim
 
    

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Hi,
 
I was trying to extract certain rows from a table. For example, if the value in
the first column is "a", "d", "k", or
"z", then I would like to extract these rows. In other words, if the
value in the column is also an element in my list (a,d,k,z), then I would like
to extract the row.
 
I've looked in the archives and the solutions I could find were restriced to
the value in the row name being a single element.
 
thanks for the help,
 
Tim




__________________________________________________



	[[alternative HTML version deleted]]

[No need to post the same message twice, please.]

Try something like:

dat <- data.frame(a=sample(c("a", "b", "d",
"k", "z"), 30, replace=TRUE),
                  b=runif(30))
subset(dat, a %in% c("a", "d", "k",
"z"))

Andy
> From: Tim Smith
> 
> Hi,
>  
> I was trying to extract certain rows from a table. For 
> example, if the value in the first column is "a", "d",
"k",
> or "z", then I would like to extract these rows. In other 
> words, if the value in the column is also an element in my 
> list (a,d,k,z), then I would like to extract the row.
>  
> I've looked in the archives and the solutions I could find 
> were restriced to the value in the row name being a single element.
>  
> thanks for the help,
>  
> Tim