|Re: HP-12C stunt-scientific?|
Message #4 Posted by Valentin Albillo on 31 Oct 2003, 4:29 a.m.,
in response to message #1 by Eric Lundgren
"Since I can still find new 'gold' 12c's but need a scientific...and considering that sin/cos/tan plus inverses are a must for me, would anyone consider trying to make do with a 12c with trig approximators?"
Yes, certainly. Please have a look at this article published in Datafile,
HP-12C Tried & Tricky Trigonometrics, where I discuss at length exactly the topic you're considering. The article enters into fine details about how to implement quality trigonometrics on the 12C (i.e: fast, accurate, full range, and complete, not run-of-the-mill, mediocrely programmed Taylor expansions) and includes a program which meets and exceeds said requirements, with plenty of interesting examples and performance tables.
"Would it leave any room for a short program in addition?"
It depends. For the classic HP-12C, the program uses all 99 steps to implement all 6 trigonometric functions (sin, cos, tan and their inverses), but if you don't need some of them, you can save some steps. On the other hand, the program will run in the 12C Platinum with a lot of room to spare, at least 124 extra steps before the GOTO bug creeps in. :-)
Best regards from V.