# NOT RUN {
is.na.ff(ff(c(NA, 1:100)), BATCHBYTES=20, VERBOSE=TRUE)
## S3 generic
is.na(ff(c(NA, 1:100)))
## Assign a missing value
x <- ff(c(NA, 1:100))
is.na(x) <- ff(c(3,5))
x
is.na(x) <- 7:8
x
# }
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