Provides sum of elements.
sum(x, na.rm=FALSE)Return value depends on argument x. If vector, returns the same as
sum. If matrix, returns vector containing the sum of
each column.
numeric or logical to be summed
logical scalar. If TRUE, remove missing values
P. Roebuck proebuck1701@gmail.com
This is an S4 generic function.
sum(1:9)
sum(matrix(1:9, 3, 3))
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