Count number of NAs per row and group of columns
This functions allows easy counting the number of NAs per row in data organized in multiple sub-groups as columns.
rowGrpNA(mat, grp)
mat |
(matrix of data.frame) data to count the number of |
grp |
(character or factor) defining which columns should be grouped (considered as replicates) |
matrix with number of NAs per group
mat2 <- c(22.2, 22.5, 22.2, 22.2, 21.5, 22.0, 22.1, 21.7, 21.5, 22, 22.2, 22.7, NA, NA, NA, NA, NA, NA, NA, 21.2, NA, NA, NA, NA, NA, 22.6, 23.2, 23.2, 22.4, 22.8, 22.8, NA, 23.3, 23.2, NA, 23.7, NA, 23.0, 23.1, 23.0, 23.2, 23.2, NA, 23.3, NA, NA, 23.3, 23.8) mat2 <- matrix(mat2, ncol=12, byrow=TRUE) gr4 <- gl(3, 4, labels=LETTERS[1:3]) # overal number of NAs per row rowSums(is.na(mat2)) # number of NAs per row and group rowGrpNA(mat2,gr4)
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