anyNA
Quickly check for missing (NA) values
Description
Discovers if an object contains a missing NA value more quickly than any(is.na()).
Usage
anyNA(x, recursive = FALSE)
Arguments
| x |
An object.
|
| recursive |
A logical value. If TRUE, checks inside of lists, except those with
a class attribute. If FALSE (the default), just checks atomic vectors or the columns of
a data.frame for missing values. anyNA never checks the
attributes of x.
|
Details
anyNA is an S3 generic function and methods can be written for it.
The default method does not look at any attributes of an object nor more than
one level into a recursive object.
For commonly-used classes of objects, this function is equivalent
to any(is.na(x)), but it is more efficient because
the search is done in compiled C++ code, and it stops looking after finding the
first missing value.
Value
returns TRUE if x contains any NA or NaN values;
otherwise, it returns FALSE.
See Also
Examples
anyNA(1:10) # FALSE
anyNA(c(-3, NA, 16)) # TRUE
anyNA(data.frame(X=1:5, Y=factor(letters[c(1:3,NA,5)]))) # TRUE
anyNA(data.frame(X=1:5, Y=factor(letters[c(1:3,NA,5)], exclude=NULL))) # FALSE