count {untb} | R Documentation |
In package untb, ecosystem data is held in one of two preferred forms:
census data and count data. Function count
creates an object
of class “count”, and as.count()
coerces to this class.
as.count(a,add="") count(a) is.count(a)
a |
Ecosystem data. In function as.count() , if a table,
interpret as species count data; otherwise, interpret as census
data. Special dispensation is made for single rows of a dataframe |
add |
Character, with default "" (empty string) meaning to
leave the species names unchanged. A non-empty string is prepended
to the species names. This is useful if the species names are
integers because the display can become confusing |
Semantically, a “count” is a list of species together with their abundance. In~R idiom, a count is a table of species abundances.
An object of class count is a table sorted from most to least abundant species. The singletons are thus tabulated last.
Function count()
takes a named vector, the elements of which
are interpreted as abundances and the names of which are interpreted
as species names.
Returns an object of class “count”.
Robin K. S. Hankin
a <- c(rep("oak",5) ,rep("ash",2),rep("elm",3),rep("xx",4)) as.count(a) data(saunders) as.count(saunders[1,-(1:150)]) jj <- sample(1:5,5,replace=TRUE) as.count(jj) as.count(jj,add="spp.")