log_add.cpp File Reference

#include "log_add.h"

Include dependency graph for log_add.cpp:

Macros
#define	MINUS_LOG_THRESHOLD   -18.42

Functions
real	logAdd (real log_a, real log_b)
real	logSub (real log_a, real log_b)
	logSub(log_a,log_b) = log(a-b) More...

Macro Definition Documentation

#define MINUS_LOG_THRESHOLD   -18.42

Function Documentation

real logAdd	(	real	log_a,
		real	log_b
	)

logAdd(log_a,log_b) = log(a+b) = log(exp(log_a)+exp(log_b)) but done in a smart way so that if log_a or log_b are large but not their difference the computation works correctly.

real logSub	(	real	log_a,
		real	log_b
	)

logSub(log_a,log_b) = log(a-b)