Hi everybody.
The question:
I get two vectors 'iFalseFalse' and 'i2'.
I think they should be the same but they are not.
Is it because R does not handle complicated logical expressions in such cases or I do something wrong?
z1 = c(NA, "", 3, NA, "", 3) z2 = c("", "", 3, NA, 3, NA) cV = (as.character(z1)==as.character(z2)) cV
[1] NA TRUE TRUE NA FALSE NA
iFalse = (c(1:(length(z1))))[(cV==FALSE)] iNonNA = (c(1:(length(z1))))[(!(is.na(cV)))] iFalse
[1] NA NA 5 NA
iNonNA
[1] 2 3 5
iFalseFalse = intersect(iFalse, iNonNA) iFalseFalse
[1] 5
i2 = (c(1:(length(z1))))[( (cV==FALSE)&&(!(is.na(cV))) )] i2
numeric(0)
Each line's results as expected. In the last line, you are going to use "&" instead of "&&"!
Uwe Ligges
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