HP49-50G: MLSV OK for -1E-495, not OK for -1E-496, ROOT OK for both

[Albert Chan]

(01-28-2024 01:51 PM)Gil Wrote:  How would it possible to get, on your calculator, about 10 or more significant correct digits for W0(x) and W-1(x),
'x being a real number very near of -1/e, but > -1/e'?

It is a solved problem, incorporated in both Lua I.W(z,k) and Python W(z,k)

I also made HP-71B version (real z, branch 0,-1) (post#18 solved with y=e^x, post#19 wth accurate ln(1+x)-x)
John Keith had kindly translated post#19 HP71B version to RPL (post #28)

All versions relied on precise 1/e = float(1/e) + eps, both constants stored in advance.