Add two count objects — +.count • untb

Adds two count objects

Usage

# S3 method for class 'count'
a + b
# S3 method for class 'census'
a + b

Arguments

a,b: objects of class count

Details

Consider count objects a and b. Then a+b is a count object that records the number of each species in a and b combined. It is as though the organisms in the surveys were pooled.

Census objects are coerced to count objects, added, then the result coerced to a count object.

The operation is commutative and associative.

Author

Robin K. S. Hankin, based on an R-help tip from Gabor Grothendiek

Examples

a <- count(c(dogs=4,pigs=0,slugs=5))
b <- count(c(slugs=4,hogs=1,frogs=19))

a+b
#> frogs slugs  dogs  hogs  pigs 
#>    19     9     4     1     0