Q function of HP-32E unveiled
Posted: Fri May 29, 2020 1:40 pm
By looking at some trace logs I found the procedures how Q is computed by HP-32E. This machine uses the same math routines as the HP-41 and uses internally 13 mantissa digits and (in case of Q) constants with 12 digits. So it is not possible to redo the approximation with an HP41 user language program (some call it FOCAL). Only a remake using MCode would do (I will not do it). An HP-42S or -71B offer more digits to the user, so on such models a user program results are the same as the HP-32E in most cases.
Used formulas:
Plots showing the approximations error.
Part 1 (used for input from -1.28 to 1.28)
Just to show what this wriggling really means, the same but the limits shifted a wee bit outside the area of validity (-1.5 .. 1.5)
((this forum apparently does not allow more than three attachments, find the rest in an append))
Used formulas:
Plots showing the approximations error.
Part 1 (used for input from -1.28 to 1.28)
Just to show what this wriggling really means, the same but the limits shifted a wee bit outside the area of validity (-1.5 .. 1.5)
((this forum apparently does not allow more than three attachments, find the rest in an append))