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RE: HP48-HP50G : Error functions ERF(z), FRESNEL integrals, PROBIT, etc.
11-09-2023, 01:48 PM (This post was last modified: 11-09-2023 05:18 PM by Gil.)
Post: #4
Gil Offline
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HP48-HP50G : Error functions Erf(x), Erfc(x) & Erf/Erfc —>x
To find the corresponding x value
of the inverse of Erf and Erfc functions,
I just reversed the order of the operations and used the built-in solver.

iERF
« 1 - -2 / —> p
«
« p 0 .5 X UTPN -
» 'X' 2 ROOT "x of Erf" —>TAG
»
»

iERFc
« 2 / —> p
«
« p 0 .5 X UTPN -
» 'X' 2 ROOT "x of Erfc" —>TAG
»
»

Regards,
Gil
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HP48-HP50G : Error functions Erf(x), Erfc(x) & Erf/Erfc —>x - Gil - 11-09-2023 01:48 PM



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