is.na-methods {Matrix} R Documentation

## is.na(), is.infinite() Methods for 'Matrix' Objects

### Description

Methods for function `is.na()`, `is.finite()`, and `is.infinite()` for all Matrices (objects extending the `Matrix` class):

x = "denseMatrix"

returns a `"nMatrix"` object of same dimension as `x`, with TRUE's whenever `x` is `NA`, finite, or infinite, respectively.

x = "sparseMatrix"

ditto.

### Usage

```## S4 method for signature 'sparseMatrix'
is.na(x)
## S4 method for signature 'dsparseMatrix'
is.finite(x)
## S4 method for signature 'ddenseMatrix'
is.infinite(x)
## ...
## and for other classes

## S4 method for signature 'xMatrix'
anyNA(x)
## S4 method for signature 'nsparseMatrix'
anyNA(x)
## S4 method for signature 'sparseVector'
anyNA(x)
## S4 method for signature 'nsparseVector'
anyNA(x)
```

### Arguments

 `x` sparse or dense matrix or sparse vector (here; any R object in general).

`NA`, `is.na`; `is.finite`, `is.infinite`; `nMatrix`, `denseMatrix`, `sparseMatrix`.

The `sparseVector` class.

### Examples

```M <- Matrix(1:6, nrow=4, ncol=3,
dimnames = list(c("a", "b", "c", "d"), c("A", "B", "C")))
stopifnot(all(!is.na(M)))
M[2:3,2] <- NA
is.na(M)
if(exists("anyNA", mode="function"))
anyNA(M)

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

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

```

[Package Matrix version 1.2-17 Index]