richness {abdiv}

Richness or number of observed species

Description

Richness or number of observed species

Usage

richness(x)

Arguments

x

A numeric vector of species counts or proportions.

Details

The richness is simply the number of nonzero elements in x. Relation to other definitions:

• Equivalent to observed_otus() in skbio.diversity.alpha.

• Equivalent to specnumber in vegan.

• Equivalent to the sobs calculator in Mothur.

Value

The number of species observed, R \geq 0.

Examples

x <- c(15, 6, 4, 0, 3, 0)
richness(x) # 4