| sum {base} | R Documentation |
sum returns the sum of all the values
present in its arguments.
sum(..., na.rm = FALSE)
... |
numeric or complex or logical vectors. |
na.rm |
logical. Should missing values be removed? |
This is a generic function: methods can be defined for it
directly or via the Summary group generic.
For this to work properly, the arguments ... should be
unnamed, and dispatch is on the first argument.
If na.rm is FALSE an NA
value in any of the arguments will cause
a value of NA to be returned, otherwise
NA values are ignored.
Logical true values are regarded as one, false values as zero.
For historical reasons, NULL is accepted and treated as if it
were integer(0).
The sum. If all of ... are of type integer or logical, then
the sum is integer, and in that case the result will be NA (with a
warning) if integer overflow occurs. Otherwise it is a length-one
numeric or complex vector.
NB: the sum of an empty set is zero, by definition.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.