Hi All,
 
Is it possible to use the subset() function to select data based on multiple
values of a single variable from a data frame.
 
My actual data set is much bigger and would like to illustrate with
following dataset
> df = data.frame(x = c('a','b','c','d','e','f','g','h','a','a','b','b'), y
= 1:12)
I would like to select all rows where x = a or b. 
 

> subset(df, x == c('a','b')) # this command did not return all rows where x
is equal to a or b

   x  y

1  a  1

2  b  2

9  a  9

12 b 12
 
> df[df$x %in% c('a','b'),] # subsetting using subscripts returned all rows 
   x  y

1  a  1

2  b  2

9  a  9

10 a 10

11 b 11

12 b 12
 
I know there might be a problem with subset syntax that I have used, but
could'nt figure out what it is. Any insights from members will be highly
appreciated and thanks for the same.
 
Regards,
 
S.N.V. Krishna

 

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