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salic
2003 Apr 14
1
NA in logical vector = data frame row numbers scrambled
...it to my problem.
I have another question.
I need to change some of my values in data frame to NA.
I use something like
df[df$v1 < 5, 5:10] <- NA
which is OK if there are no NA values in v1.
here are some foo attempts
> test
index cislo time den hod min zatizdp plyndp skalice
5 5 1 37693.79 13 19 0 106.6707 533.0288 5.932448
6 6 1 37693.80 13 19 15 106.2308 533.8799 6.008640
7 7 1 37693.81 13 19 30 106.3643 534.5321 5.960807
8 8 1 37693.82 13 19 45 106.9483 533.9640 5.962759
9 9 1 37693.83 13 20 0 106.9289 5...