HP Forums / Not HP Calculators / Not quite HP Calculators - but related v / Free42 possible accuracy flaw

Post Reply 
Free42 possible accuracy flaw
03-27-2022, 10:58 PM
Post: #32
Albert Chan Offline
Senior Member
 		Posts: 2,517
Joined: Jul 2018
RE: Free42 possible accuracy flaw
(03-25-2022 08:35 AM)Thomas Okken Wrote:  Now I am curious what makes that [3^729] an interesting test case, though!

For 34 decimal digits, 3^729 is close to half-way.

round38(3^729) = 6.6281860542418717610517286421447974859E+347

However, Intel Decimal get this right really by luck. (see previous post)
The flawed step, correction *after* rounded exponential, does not hurt the result.

round38(log3 * 729) = 800.88835843905196502713377771652123869

800.8883584390519650271337777165212
E^X                        → 6.628186054241871761051728642144541e347
3.869E-32
X<>Y * LASTX +      → 6.628186054241871761051728642144797e347
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: Free42 possible accuracy flaw - Werner - 03-23-2022, 07:30 AM
RE: Free42 possible accuracy flaw - Werner - 03-23-2022, 08:49 AM
RE: Free42 possible accuracy flaw - Werner - 03-25-2022, 07:03 AM
RE: Free42 possible accuracy flaw - Werner - 03-30-2022, 08:04 AM
RE: Free42 possible accuracy flaw - Albert Chan - 03-27-2022 10:58 PM
RE: Free42 possible accuracy flaw - Werner - 03-25-2022, 08:53 AM



User(s) browsing this thread: 1 Guest(s)

Contact Us | The Museum of HP Calculators | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication