trigammaInverse {limma} | R Documentation

## Inverse Trigamma Function

### Description

The inverse of the trigamma function.

### Usage

    trigammaInverse(x)

### Arguments

`x` | numeric vector or array

### Details

The function uses Newton's method with a clever starting value to ensure monotonic convergence.

### Value

Numeric vector or array `y` satisfying `trigamma(y)==x`.

### Note

This function does not accept a data.frame as argument although the base package function `trigamma` does.

### Author(s)

Gordon Smyth

### See Also

This function is the inverse of `trigamma` in the base package.

This function is called by `fitFDist`.

### Examples

    y <- trigammaInverse(5)
    trigamma(y)

[Package limma version 3.42.2 Index]