R: Arithmetic Operators

ldfactorial {phangorn} | R Documentation

## Arithmetic Operators

### Description

double factorial function

### Usage

    ldfactorial(x)

    dfactorial(x)

### Arguments

`x` | a numeric scalar or vector

### Value

`dfactorial(x)` returns the double factorial, that is x\!\! = 1 * 3 * 5 * … * x and `ldfactorial(x)` is the natural logarithm of it.

### Author(s)

Klaus Schliep klaus.schliep@gmail.com

### See Also

`factorial`, `howmanytrees`

### Examples

    dfactorial(1:10)

[Package phangorn version 2.6.2 Index]