richness {abdiv} | R Documentation |

## 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
```

[Package

*abdiv*version 0.2.0 Index]