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Calculator Accuracy & Usefulness
05-29-2015, 06:19 AM
Post: #37
RE: Calculator Accuracy & Usefulness
(05-27-2015 10:41 PM)Den Belillo (Martinez Ca.) Wrote:  Mike states somewhere that closeness to 9 is not the absolute accuracy of these machines.

That's also why I said here several times over the years. ;-) The essential point is that right after the first step of the "forensics" test the calculator is working with approximations. It does not calculate the cosine of sin(9), but that of 0,1564344650.

For those who are interested in the "perfect" result a calculator with n digits working precision should return, I once suggested a small program for the 34s. The latter is perfect for such tests since it features up to 30+ digit precision as well as a nice RSD function that rounds intermediate results to n significant digits, thus emulating a "perfect" calculator with that precision.

Here is the link to that post in the old forum. So a perfect 10-digit device should return 9,000417403, and one with 12-digit precision should yield 8,99999864267. And that's exactly what most HPs since the mid-seventies deliver.

Dieter
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Messages In This Thread
RE: Calculator Accuracy & Usefulness - d b - 05-24-2015, 05:16 AM
RE: Calculator Accuracy & Usefulness - ttw - 05-24-2015, 06:31 PM
RE: Calculator Accuracy & Usefulness - d b - 05-27-2015, 10:41 PM
RE: Calculator Accuracy & Usefulness - Dieter - 05-29-2015 06:19 AM



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