R/problems.R

In sandan/tutoRIal:

# implement a tree as a list of lists

# given a tree whose nodes have numeric data, compute the mean value of the data

# what is the result of:
a <- c(F, T, 2)
is.list(c)
is.double(a)
is.atomic(c(a, "4"))
is.integer(c(a, "a"))
b <- list( "a". 1.47)
is.vector(b)


# split-apply-combine

# NA and NaNs