
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(ab)
Documentation
Some simple functions for log operations.
 Author:
 Samy Bengio (bengio@idiap.ch)
Alphabetic index HTML hierarchy of classes or Java
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