Description Usage Arguments Details Value Note Author(s) Examples

Given *log(x)* and *log(y)* this function calculates *log(x + y)*
using the identity

*#
log(x + y) = log(x) + log(1 + exp[log(y) - log(x)])*

1 |

`x` |
Numeric vector or matrix. |

`y` |
Numeric vector or matrix of same dimensions as |

`base` |
Base of the logarithm to be used. If |

If `y`

is missing the function is applied recuresively to all elements of `x`

, i.e., all
elements of `x`

are added up. If both `x`

and `y`

are given they are added element wise.

If only `x`

is given a scalar is returned, representing the sum of all elements of `x`

.
Otherwise a vector or matrix of the same dimensions as `x`

and `y`

.

This function is useful for cases where `x`

and `y`

cannot be represented accurately by machine numbers
but log(x) and log(y) can.

Peter Humburg

1 2 3 4 5 6 7 8 |

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