R: Sum of Vector Elements

sum {base} | R Documentation

## Sum of Vector Elements

### Description

`sum` returns the sum of all the values present in its arguments. 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.

### Usage

    sum(..., na.rm=FALSE)

### Arguments

`...` | numeric or complex vectors.
`na.rm` | logical. Should missing values be removed?

### Details

This is a generic function: methods can be defined for it directly or via the `Summary` group generic.

### Value

The sum. If all of `...` are of type integer, then so is the sum, and in that case the result will be `NA` (with a warning) if integer overflow occurs.
NB: the sum of an empty set is zero, by definition.

### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

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