sum
Sums and Products
Description
Returns the sum or product of all of the elements of all of the
arguments. Missing values (NAs) are allowed, but you can
remove them prior to performing any computation.
Usage
sum(..., na.rm = FALSE)
prod(..., na.rm = FALSE)
Arguments
| ... |
numeric or complex objects. Missing values (NAs) are allowed.
|
| na.rm |
a logical value. TRUE specifies that missing values should
be removed before computations are performed. If the elements include
missing values, and you do not specify na.rm = TRUE, the return
value is NA. The default is FALSE.
|
Details
These functions are members of the Summary group of generic functions.
Value
returns the sum or product of all elements of all arguments. If the total
length of all the arguments is 0, sum returns 0 and
prod returns 1.
See Also
Examples
geo.mean <- function(x) prod(x)^(1/length(x))
sum(1:4)