is.na-methods {Matrix}R Documentation

is.na(), is.finite() Methods for 'Matrix' Objects

Description

Methods for generic functions is.na(), is.nan(), is.finite(), is.infinite(), and anyNA(), for objects inheriting from virtual class Matrix or sparseVector.

Usage

## S4 method for signature 'dsparseMatrix'
is.na(x)
## S4 method for signature 'dsparseMatrix'
is.nan(x)
## S4 method for signature 'dsparseMatrix'
is.finite(x)
## S4 method for signature 'dsparseMatrix'
is.infinite(x)
## S4 method for signature 'dsparseMatrix'
anyNA(x)
## ...
## and for other classes

Arguments

x

an R object, here a sparse or dense matrix or vector.

Value

For is.*(), an nMatrix or nsparseVector matching the dimensions of x and specifying the positions in x of (some subset of) NA, NaN, Inf, and -Inf. For anyNA(), TRUE if x contains NA or NaN and FALSE otherwise.

See Also

NA, NaN, Inf

Examples

(M <- Matrix(1:6, nrow = 4, ncol = 3,
             dimnames = list(letters[1:4], LETTERS[1:3])))
stopifnot(!anyNA(M), !any(is.na(M)))

M[2:3, 2] <- NA
(inM <- is.na(M))
stopifnot(anyNA(M), sum(inM) == 2)

(A <- spMatrix(nrow = 10, ncol = 20,
               i = c(1, 3:8), j = c(2, 9, 6:10), x = 7 * (1:7)))
stopifnot(!anyNA(A), !any(is.na(A)))

A[2, 3] <- A[1, 2] <- A[5, 5:9] <- NA
(inA <- is.na(A))
stopifnot(anyNA(A), sum(inA) == 1 + 1 + 5)

[Package Matrix version 1.5-3 Index]