ffbase (version 0.6-2)

is.na.ff: 'Not Available' / Missing Values for ff vectors The generic function is.na indicates which elements are missing. The generic function is.na<- sets elements to NA.

Description

'Not Available' / Missing Values for ff vectors The generic function is.na indicates which elements are missing. The generic function is.na<- sets elements to NA.

Usage

## S3 method for class 'ff':
is.na(x, ...)

  ## S3 method for class 'ff':
is.na(x, ...) <- value

Arguments

x

a ff vector

...

other parameters passed on to chunk

value

a suitable ff index vector for use with x

Value

• A logical ff vector of the same length of x indicating if the ff vector contains missing values.

See Also

is.na, ffvecapply

Examples

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