Calculate max/min (across columns) for every row in R

> df <- data.frame("a"=c(1,NA,3,4,5), "b"=c(1,NA,NA,5,6), "c"=c(1,NA,5,6,2)) > df    a  b  c 1  1  1  1 2 NA NA NA 3  3 NA  5 4  4  5  6 5  5  6  2

# --- first we will apply this for each row --- > apply(X=df, MARGIN=1, FUN=max) [1]  1 NA NA  6  6 > apply(X=df, MARGIN=1, FUN=max, na.rm=T) [1]    1 -Inf    5    6    6 Warning message: In FUN(newX[, i], ...) : no non-missing arguments to max; returning -Inf

# --- We can apply this for each column --- > apply(X=df, MARGIN=2, FUN=max, na.rm=T) a b c  5 6 6

Created by Pretty R at inside-R.org