| is.na-methods {Matrix} | R Documentation |
Methods for function is.na() for all Matrices (objects
extending the Matrix class):
returns a "nMatrix" object of same
dimension as x, with TRUE's whenever x was NA.
ditto.
## S4 method for signature 'sparseMatrix' is.na(x)
x |
sparse or dense matrix. |
NA, is.na;
nMatrix,
denseMatrix,
sparseMatrix.
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)
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)