select rows with identical columns from a data frame

Hello,

Try the following.

complete.cases(f) & apply(f, 1, function(x) all(x == x[1]))


Hope this helps,

Rui Barradas

Em 18-01-2013 20:53, Sam Steingold escreveu:

I have a data frame with several columns.
I want to select the rows with no NAs (as with complete.cases)
and all columns identical.
E.g., for

--8<---------------cut here---------------start------------->8---

f <- data.frame(a=c(1,NA,NA,4),b=c(1,NA,3,40),c=c(1,NA,5,40))
f

   a  b  c
1  1  1  1
2 NA NA NA
3 NA  3  5
4  4 40 40
--8<---------------cut here---------------end--------------->8---

f[ which( rowSums(f==f[[1]]) == length(f) ), ]

I want the vector TRUE,FALSE,FALSE,FALSE selecting just the first
row because there all 3 columns are the same and none is NA.

thanks!