rowCounts {matrixStats} | R Documentation |
Counts the number of TRUE values in each row (column) of a matrix.
rowCounts(x, na.rm=FALSE, ...) colCounts(x, na.rm=FALSE, ...) rowAlls(x, na.rm=FALSE, ...) colAlls(x, na.rm=FALSE, ...) rowAnys(x, na.rm=FALSE, ...) colAnys(x, na.rm=FALSE, ...)
x |
A logical NxK matrix . |
na.rm |
If TRUE , NA s are excluded first, otherwise not. |
... |
Not used. |
rowCounts()
(colCounts()
) returns an integer
vector
of length N (K).
The other methods returns a logical
vector
of length N (K).
Henrik Bengtsson (http://www.braju.com/R/)
x <- matrix(FALSE, nrow=10, ncol=5) x[3:7,c(2,4)] <- TRUE x[2:4,] <- TRUE x[,1] <- TRUE x[5,] <- FALSE x[,5] <- FALSE print(x) print(rowCounts(x)) # 1 4 4 4 0 3 3 1 1 1 print(colCounts(x)) # 9 5 3 5 0 print(rowAnys(x)) print(which(rowAnys(x))) # 1 2 3 4 6 7 8 9 10 print(colAnys(x)) print(which(colAnys(x))) # 1 2 3 4