HP Forum Archive 18

[ Return to Index | Top of Index ]

where is 35s cos bug Message #1 Posted by Andrew Nikitin on 5 Oct 2008, 2:32 p.m. It was mentioned that 35s cannot proprely calculate cos (and some other trig functions) in certain ranges. Where can I find examples with an appropriate argument and erroneous result given by 35s? I cannot seem to find the bad inputs.

Re: where is 35s cos bug Message #2 Posted by George Bailey (Bedford Falls) on 5 Oct 2008, 2:35 p.m., in response to message #1 by Andrew Nikitin Do a Google site search like so: cos bug hp 35s

Re: where is 35s cos bug Message #3 Posted by Andrew Nikitin on 5 Oct 2008, 10:32 p.m., in response to message #2 by George Bailey (Bedford Falls) Google finds numerous pages with a sentence "Cos(x) for x near 90 is dud". It also, surprisingly, finds this very thread. However, what I am trying to find is actual numeric example of X where cos X is calculated incorrectly by 35s. If found mentions of "cos(89.999) bug", but my 35s says cos(89.999)=1.74532924306e-4 which agrees to 9 digits with what PC tells me. Is that a bug? That it is only 9 digits? Must be all 12? Edited: 5 Oct 2008, 10:39 p.m.

The HP-33s/35s trig bug, tabulated Message #4 Posted by Karl Schneider on 6 Oct 2008, 1:41 a.m., in response to message #1 by Andrew Nikitin Andrew -- Here is what you seek: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv017.cgi?read=123880#123880 The new HP-20b gives all correct results, so I believe that the bug has been addressed, and will not recur. -- KS

[ Return to Index | Top of Index ]

Go back to the main exhibit hall