R: 'Not Available' / Missing Values for ff vectors

is.na.ff {ffbase} | R Documentation

## 'Not Available' / Missing Values for ff vectors

### Description

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 replacement 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)
    ## 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

[Package ffbase version 0.13.1 Index]