HP300s smartcalc error Scott Smith Junior Member Posts: 3 Threads: 1 Joined: Jan 2010 01-05-2010, 12:31 AM Hi, When I do the following calc on my smartcalc I get the wrong ansswer. Any ideas anyone? The calc is 78724*pi*.075^2*.5 I get an answer of 800 instead of around 695. Thanks Scott Scott Smith Junior Member Posts: 3 Threads: 1 Joined: Jan 2010 01-05-2010, 12:42 AM further to this if I multiply by .500000001 instead of 0.5 I get the correct answer. Looks like I am back to my 48 or 30s Hubert Weikert Junior Member Posts: 38 Threads: 3 Joined: Sep 2007 01-05-2010, 11:31 AM Hi, With my 300s I get 221*(329/800)*PI, which converts with S<=>D to 695.5839564 Hubert Norman Dziedzic Member Posts: 203 Threads: 29 Joined: Nov 2009 01-05-2010, 01:49 PM Funny, For 221*(329/800)*PI I get 285.527... Did you copy something down wrong? Scott Smith Junior Member Posts: 3 Threads: 1 Joined: Jan 2010 01-05-2010, 04:36 PM Hi Guys, I too get 285.382 from the above formula. I have done this eqn over and over again on my 300s and always get 800. I have even saved intermediate values in registers and still get the wrong answer. My 38G gives me the correct answers, so too does my 35s and 48. Looks like I got a dud. Tim Wessman Posting Freak Posts: 1,278 Threads: 44 Joined: Jul 2007 01-05-2010, 07:26 PM I repeated it on my emulator. I'm not sure if it is the actual code used in the unit though, or a reimplementation. . . I suspect it is a setting of some kind causing the problems. Not sure which one though. TW Bart (UK) Posting Freak Posts: 850 Threads: 10 Joined: Mar 2009 01-06-2010, 12:56 PM Hi,I have tried this by doing = between each multiplication (and S<=>D where necessary) and in the second last step have 1391.167193. Multiply this by 0.5 (i.e. display is "Ans x 0.5") and it returns 800 as well.However, the correct answer is displayed if the equation is done in reverse. edit: taking the last step as "Ans / 2" also gives 800 Edited: 6 Jan 2010, 1:00 p.m. Walter B Posting Freak Posts: 4,587 Threads: 105 Joined: Jul 2005 01-06-2010, 01:13 PM Quote: in the second last step have 1391.167193. Multiply this by 0.5 (i.e. display is "Ans x 0.5") and it returns 800 as well. ... taking the last step as "Ans / 2" also gives 800 Does this mean this device is unable to calculate 1391.167193 / 2 ? That's elementary math! :( Hard to believe. Hubert Weikert Junior Member Posts: 38 Threads: 3 Joined: Sep 2007 01-06-2010, 03:58 PM Sorry, I had not checked what I wrote! The correct term is (221+329/800)*PI, which results in 695.58... The error depends on the setting of the fraction mode (SET UP/down). My calc is in MATH (MthIO) format mode. setting ab/c (Mixed) gives 695.58... setting d/c (improper) gives 800, thats the erroneus display. Hubert Edited: 7 Jan 2010, 11:27 a.m. « Next Oldest | Next Newest »

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