Conditional Element Selection for ff vectors.
Similar as ifelse in the base package but only works with yes and no as ff vectors.
ffifelse(test, yes, no)
test |
logical or boolean |
yes |
an |
no |
an |
An ff vector of the same length as test.
data(iris)
ffiris <- as.ffdf(iris)
ffifelse(ffiris$Sepal.Length < 5, TRUE, NA)
ffifelse(ffiris$Sepal.Length < 5, factor(rep("abc", nrow(ffiris))), NA)
ffifelse(ffiris$Sepal.Length < 5, Sys.Date(), factor("abc"))
ffifelse( ffiris$Sepal.Length < 5, Sys.Date(), ff(seq.Date( Sys.Date()+1
, Sys.Date()+nrow(ffiris), by = "day")))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.