eea771ea64
improve accuracy of tanh function using the implementation of https://www.math.utah.edu/~beebe/software/ieee/tanh.pdf by changing from (/ (- 1 exp2z) (+ 1 exp2z)) to (- 1 (/ 2 (+ 1 exp2z)) the accuracy after rounding is increased (I was comparing with bftanh) and removes the fluctuations around z=18.35 using the polynomial for z ϵ(1.290e-8 to 0.549) seems to increase the accuracy after rounding even further see comparison: http://pasterack.org/pastes/48436 especially the fact that (< (tanh 18.36)(tanh 18.37)) ;=> #t was tripping me up the two extra conditions (z . < . 1.29e-8) and (z . < . 0.549) are optional to solve this |
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