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2010 Feb 01
3
merging data frames gives all NAs
...runways, with a
Runway column.
I am trying to subset arrgnd into a dat frame for each selected runway,
and then combine them back together using the following code:
for (j in 1:nr) { # nr = number of user-selected runways
ar4rw = arrgnd[arrgnd$Runway==rwy[j],]
if (j == 1) {
arrw = ar4rw
}
else {
arrw = merge(arrw, ar4rw)
}
}
but, the merge step gives me a data frame with all NAs. In addition,
ar4rw always gets a row with NAs at the start, which I do not
understand. There are no rows with all NAs in the arrgnd data frame.
> ar4rw[1:2,] # firs...