Dear S-plus users,
I encountered a problem in using logical operators
on vector.
In my data file, testData, there are three variables. I want to select
"speldur" when both "hrg" and "filter1" are. The program and data are as follows
:
trimcase<-function(A1, opt){
filter1 <-
A1$filter1
speldur<- A1$speldur
hrg <-
A1$hrg
speli <-
speldur[hrg==1&filter1==1]
speli
}
testData <-
hrg filter1 speldur
1
1 1
11
2 2
1 12
3
1 NA
13
4 2
1 NA
5
2 NA 4
The answer should be 11, but the output
>trimcase(testData)
>[1] 11 NA
I also tried when there is no missing values in the data, the output is
correct. It seems caused by missing values.
Can anyone point to me the reasons and suggest me how to deal with missing
values?
Thanks,
Haiyan Gao