| prod {base} | R Documentation |
Product of Vector Elements
Description
prod returns the product of all the values
present in its arguments.
Usage
prod(..., na.rm = FALSE)
Arguments
... |
numeric or complex or logical vectors. |
na.rm |
logical. Should missing values be removed? |
Details
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.
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.
Logical true values are regarded as one, false values as zero.
For historical reasons, NULL is accepted and treated as if it
were numeric(0).
Value
The product, a numeric (of type "double") or complex vector of length one.
NB: the product of an empty set is one, by definition.
S4 methods
This is part of the S4 Summary
group generic. Methods for it must use the signature
x, ..., na.rm.
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
See Also
‘plotmath’ for the use of prod in plot annotation.
Examples
print(prod(1:7)) == print(gamma(8))