Calculator forensics



#2

I read of the accuracy test performed using 9 sin cos tan arc tan arc cos arc sin in sequence. In the 50g in the degrees mode it shows 8.999999864267. I wondered how it would perform in the radians mode so I used Pi/20 (same 9 degrees) repeated the test and divided the results into the original angle and multiplied by 9 to get a comparable number (9). It showed 8.999999999995
It seems the algorithms are more compatible with the radian mode. Sam


#3

Quote:
It seems the algorithms are more compatible with the radian mode

Hi, Sam --

Have a look here (discussion from me):

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv017.cgi?read=113143#113143

And here (discussion from Valentin):

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv014.cgi?read=69026

In fairness, the author of the forensic did not intend it to be a measure of a calculator's general accuracy; he intended it to be an indicator of internal algorithms and precision for purposes of comparison between models.

-- KS


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