\[\left(\frac{1}{\sqrt{\pi}} \cdot e^{\left|x\right| \cdot \left|x\right|}\right) \cdot \left(\left(\left(\frac{1}{\left|x\right|} + \frac{1}{2} \cdot \left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{3}{4} \cdot \left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{15}{8} \cdot \left(\left(\left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right)\]
Test:
Jmat.Real.erfi, branch x greater than or equal to 5
Bits:
128 bits
Bits error versus x
Time: 1.4 m
Input Error: 1.5
Output Error: 0.9
Log: ⚲
Profile: 🕒
\(\frac{e^{\left|x\right| \cdot \left|x\right|}}{\sqrt{\pi}} \cdot \left(\left(\frac{\frac{\frac{\frac{3}{4}}{\left|x\right|}}{\left|x\right| \cdot \left|x\right|}}{\left|x\right| \cdot \left|x\right|} + \frac{\frac{1}{2}}{{\left(\left|x\right|\right)}^3}\right) + \left(\frac{\frac{\frac{15}{8}}{{\left(\left|x\right|\right)}^3}}{\frac{{\left(\left|x\right|\right)}^3}{\frac{1}{\left|x\right|}}} + \frac{1}{\left|x\right|}\right)\right)\)
  1. Started with
    \[\left(\frac{1}{\sqrt{\pi}} \cdot e^{\left|x\right| \cdot \left|x\right|}\right) \cdot \left(\left(\left(\frac{1}{\left|x\right|} + \frac{1}{2} \cdot \left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{3}{4} \cdot \left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{15}{8} \cdot \left(\left(\left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right)\]
    1.5
  2. Applied simplify to get
    \[\color{red}{\left(\frac{1}{\sqrt{\pi}} \cdot e^{\left|x\right| \cdot \left|x\right|}\right) \cdot \left(\left(\left(\frac{1}{\left|x\right|} + \frac{1}{2} \cdot \left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{3}{4} \cdot \left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{15}{8} \cdot \left(\left(\left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right)} \leadsto \color{blue}{\frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\left({\left(\frac{1}{\left|x\right|}\right)}^3\right)}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}}}\]
    1.4
  3. Using strategy rm
    1.4
  4. Applied add-exp-log to get
    \[\frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\color{red}{\left({\left(\frac{1}{\left|x\right|}\right)}^3\right)}}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}} \leadsto \frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\color{blue}{\left(e^{\log \left({\left(\frac{1}{\left|x\right|}\right)}^3\right)}\right)}}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}}\]
    5.5
  5. Applied simplify to get
    \[\frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\left(e^{\color{red}{\log \left({\left(\frac{1}{\left|x\right|}\right)}^3\right)}}\right)}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}} \leadsto \frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\left(e^{\color{blue}{-\log \left({\left(\left|x\right|\right)}^3\right)}}\right)}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}}\]
    5.5
  6. Applied taylor to get
    \[\frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\left(e^{-\log \left({\left(\left|x\right|\right)}^3\right)}\right)}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}} \leadsto \frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\left(e^{-\log \left({\left(\left|x\right|\right)}^3\right)}\right)}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}}\]
    5.5
  7. Taylor expanded around 0 to get
    \[\frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\left(e^{-\color{red}{\log \left({\left(\left|x\right|\right)}^3\right)}}\right)}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}} \leadsto \frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\left(e^{-\color{blue}{\log \left({\left(\left|x\right|\right)}^3\right)}}\right)}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}}\]
    5.5
  8. Applied simplify to get
    \[\frac{\left(\left(\frac{{\left(\frac{1}{\left|x\right|}\right)}^3}{2} + \frac{1}{\left|x\right|}\right) + \left({\left(\frac{1}{\left|x\right|}\right)}^3 \cdot \left(\frac{1}{\left|x\right|} \cdot \frac{3}{4}\right)\right) \cdot \frac{1}{\left|x\right|}\right) + \frac{15}{8} \cdot \frac{{\left(e^{-\log \left({\left(\left|x\right|\right)}^3\right)}\right)}^2}{\left|x\right|}}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}} \leadsto \frac{\frac{\frac{15}{8} \cdot \frac{1}{{\left(\left|x\right|\right)}^3}}{\frac{\left|x\right|}{\frac{1}{{\left(\left|x\right|\right)}^3}}} + \left(\left(\frac{\frac{1}{2}}{{\left(\left|x\right|\right)}^3} + \frac{1}{\left|x\right|}\right) + \left(\frac{\frac{1}{\left|x\right|}}{{\left(\left|x\right|\right)}^3} \cdot \frac{3}{4}\right) \cdot \frac{1}{\left|x\right|}\right)}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}}\]
    1.0
  9. Applied final simplification
  10. Applied simplify to get
    \[\color{red}{\frac{\frac{\frac{15}{8} \cdot \frac{1}{{\left(\left|x\right|\right)}^3}}{\frac{\left|x\right|}{\frac{1}{{\left(\left|x\right|\right)}^3}}} + \left(\left(\frac{\frac{1}{2}}{{\left(\left|x\right|\right)}^3} + \frac{1}{\left|x\right|}\right) + \left(\frac{\frac{1}{\left|x\right|}}{{\left(\left|x\right|\right)}^3} \cdot \frac{3}{4}\right) \cdot \frac{1}{\left|x\right|}\right)}{\frac{\sqrt{\pi}}{e^{\left|x\right| \cdot \left|x\right|}}}} \leadsto \color{blue}{\frac{e^{\left|x\right| \cdot \left|x\right|}}{\sqrt{\pi}} \cdot \left(\left(\frac{\frac{\frac{\frac{3}{4}}{\left|x\right|}}{\left|x\right| \cdot \left|x\right|}}{\left|x\right| \cdot \left|x\right|} + \frac{\frac{1}{2}}{{\left(\left|x\right|\right)}^3}\right) + \left(\frac{\frac{\frac{15}{8}}{{\left(\left|x\right|\right)}^3}}{\frac{{\left(\left|x\right|\right)}^3}{\frac{1}{\left|x\right|}}} + \frac{1}{\left|x\right|}\right)\right)}\]
    0.9
  11. Removed slow pow expressions

Original test:


(lambda ((x default))
  #:name "Jmat.Real.erfi, branch x greater than or equal to 5"
  (* (* (/ 1 (sqrt PI)) (exp (* (fabs x) (fabs x)))) (+ (+ (+ (/ 1 (fabs x)) (* (/ 1 2) (* (* (/ 1 (fabs x)) (/ 1 (fabs x))) (/ 1 (fabs x))))) (* (/ 3 4) (* (* (* (* (/ 1 (fabs x)) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))))) (* (/ 15 8) (* (* (* (* (* (* (/ 1 (fabs x)) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x)))))))