Description Usage Arguments Value Author(s) Examples
Prevents underflow/overflow using the log-sum-exp trick
1 | ISOpure.util.logsum(xx, dimen);
|
xx |
A matrix of numerical values |
dimen |
The dimension along which the long sum is taken (1 for row, 2 for column) |
Returns log(sum(exp(x),dimen)), the log sum of exps, summing over dimension dimen but in a way that tries to avoid underflow/overflow.
Gerald Quon and Catalina Anghel
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