logcosh {limma} | R Documentation

## Logarithm of cosh

### Description

Compute `log(cosh(x))` without floating overflow or underflow

### Usage

    logcosh(x)

### Arguments

`x` | a numeric vector or matrix.

### Details

The computation uses asymptotic expressions for very large or very small arguments. For intermediate arguments, `log(cosh(x))` is returned.

### Value

Numeric vector or matrix of same dimensions as `x`.

### Author(s)

Gordon K Smyth

### See Also

`logsumexp`

### Examples

    x <- c(1e-8,1e-7,1e-6,1e-5,1e-4,1,3,50,800)
    logcosh(x)
    log(cosh(x))

[Package limma version 3.38.3 Index]