On Mar 26, 2011, at 7:05 PM, Sebastián Daza wrote:
Hi everyone,
I have just got different samples from a dataframe (independent and
exclusive, there aren't common elements among them). I want to
create a variable that indicate the sampling selection of the
elements in the original dataframe (for example, 0 = no selected, 1=
sample 1, 2=sample 2, etc.).
I have tried to do it with ifelse command, but the problem is that
the second line replaces the values of the first line, and I haven't
been able to do it with the if command (I got this error: In if (data
$school %in% sample1) { :
the condition has length > 1 and only the first element will be used)
Nested ifelse's should work. There may be a limit to nested depth.
data$selection <- ifelse(data$school %in% sample1, 1, # else
ifelse(data$school %in% sample2, 2, #else
0) )
Any ideas?
Thank you in advance.
--
Sebastián Daza
sebastian.d...@gmail.com
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