twLogSumExp: twLogSumExp
In twMisc: Utility functions of tw

Description Usage Arguments Details Author(s)

calculates the log(sum(exp(x))) in numerically safer way

1	twLogSumExp(x, shiftUpperBound = FALSE, shiftLowerBound = FALSE)

`x`	vector to be summed
`shiftUpperBound`	use this if x has a clear upper bound
`shiftLowerBound`	use this if x has a clear lower bound

Before taking the exponent, all x are shifted towards zero. By default the median of x is subtracted. If shiftUpperBound then max(x) is subtracted. This is useful if the distribution of x has a strong left tail but a defined upper bound. If shiftLowerBound then min(x) is subtracted. This is useful if the distribution of x has a strong right tail but a defined lower bound.

Thomas Wutzler

twMisc documentation built on May 2, 2019, 6:11 p.m.