mvc (version 1.3)

logsum: Computes the cumulative sum in terms of logarithmic in- and output...

Description

Computes the cumulative sum in terms of logarithmic in- and output Useful to avoid numerical underflow when summing products of probabilities When using this function, one can sum sums of log probabilities See also: http://goo.gl/aJopi

Usage

logsum(logx)

Arguments

logx

a vector of log numbers (need not be probabilities)

Value

Examples

x=c(1,2,3)
exp(logsum(log(x)))
# 6
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