logsumexp {limma} | R Documentation

## Log Sum of Exponentials

### Description

Compute `log( exp(x)+exp(y) )` without floating overflow or underflow

### Usage

    logsumexp(x, y)

### Arguments

`x` | a numeric vector or matrix.
`y` | a numeric vector or matrix of same size as `x`.

### Details

The computation uses `logcosh()`.

### Value

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

### Author(s)

Gordon K Smyth

### See Also

`logcosh`

### Examples

    x <- y <- c(1e-8,1e-7,1e-6,1e-5,1e-4,1,3,50,800)
    logsumexp(x,y)
    log( exp(x)+exp(y) )

[Package limma version 3.50.3 Index]