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By comparing Φ(x) and f(x) we notice Φ(x) contains 3 numerical approximations. Therefore, we know in advance Φ(x) will take < 3^2 times f(x) + few more arithmetic operations ... roughly: Φ(x) will take < 100 sec. Leave the integrator accuracy 100.  Maths Dirac Integral.sm (12kb) downloaded 19 time(s).
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Rank: Guest
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Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
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... [suite], you can replace the two constant terms by their
decimal evaluation. It will drop the timing nearly by ½.
It will not significantly change the the integration due
to the integrator not so accurate !
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