Perform rowwise operations

Usage

rowR(data, vars, type, label, na.rm = T, filter = NULL, direction, dt = F)

data: dataset
vars: vector of vars the rowwise operation should be perfomed. If missing, all columns are assigned
type: pmin, pmax, all.na, any.na, sum.na, sum or fill
label: label of the new variable. If missing, type is inserted (e.g. pmin)
na.rm: whether NAs should be removed (default = T)
filter: whether rows with all.na or any.na should be removed
direction: the direction of the rowwise fill. Can be "left", "rigth", "leftright" and "rightleft". Corresponds to "updown".

the parent data frame with a new variable based on the selected rowwise operator or a filtered dataset