### UF extended/arbitrary precision

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#### UF extended/arbitrary precision

« on: September 13, 2018, 06:14:36 PM »
I've always been a little suspicious of ny form of extended pricision in software, simply because I've never looked into how it works to write some myself. Anyway I decided it was time I at least checked out how well UF worked doing it.

So I tried 3 different versions of formulas to approximate Pi since that way it would be fairly easy to check the results against the PiDay million digits of Pi online.

UF says it does 10,000 SF if set up correctly, to test e.g. at normal magnification set arbitrary precision to "always" and extra precision  to 9995 because 5 is the default at that magnification.

Using my own (slow) Pi approximation (get point halfway between (1,0) and (0,1) and rescale so on the circle radius 1 at the same angle, get point halfway from here to (1,0) and repeat etc.etc.) - got it to work to almost 10,000 sf, also used x+sin(x), this was correct to a full corrected last digit for 10,000 sf and the Chudnovsky was also correct to a corrected last digit for 10,000 sf.
NB. UF's #pi value is also corrected to the last of the 10,000 sf at least when the precision is set up as above.

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