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Pi
I computed the digits of pi using Borwein's method. I used a
divide-and-conquer multiply routine, hand coded in 68020 assembly
language. It was capable of multiplying two 1.25+ million digit
numbers in about 20 minutes on an HP 9000/370 (a 25MHz 68030?).
The computation took a little over three days, at which point I had
the answer in *binary*. :-( The binary to decimal conversion was
no simple task.
I checked my results by performing the same calculation to 2.5+
million digit precision, (9 days) and compared the binaries. The
only independent check has come from David Bailey, whose results
agree with mine to at least 1 million digits (probably.... The
last 100 digits are the same.)
divide-and-conquer multiply routine, hand coded in 68020 assembly
language. It was capable of multiplying two 1.25+ million digit
numbers in about 20 minutes on an HP 9000/370 (a 25MHz 68030?).
The computation took a little over three days, at which point I had
the answer in *binary*. :-( The binary to decimal conversion was
no simple task.
I checked my results by performing the same calculation to 2.5+
million digit precision, (9 days) and compared the binaries. The
only independent check has come from David Bailey, whose results
agree with mine to at least 1 million digits (probably.... The
last 100 digits are the same.)
767 pages, Kindle Edition
First published October 4, 2009
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Displaying 1 - 2 of 2 reviews
February 10, 2019
3.14159 stars
May 14, 2025
✒️ Reading this was gripping, suspenseful, the twist two-thirds in made me laugh, and the dénouement was shocking. It was worthwhile.
📕In the public domain.
જ⁀🟢Read e-book on ρ𝕣ꪮ𝕛ꫀᥴ𝕥 ᧁꪊ𝕥ꫀꪀ᥇ꫀ𝕣ᧁ.
જ⁀🟣 Kindle.
༺༻༺༻✬༺༻༺༻༺༻༺༻✬༺༻༺༻
📕In the public domain.
જ⁀🟢Read e-book on ρ𝕣ꪮ𝕛ꫀᥴ𝕥 ᧁꪊ𝕥ꫀꪀ᥇ꫀ𝕣ᧁ.
જ⁀🟣 Kindle.
༺༻༺༻✬༺༻༺༻༺༻༺༻✬༺༻༺༻
Displaying 1 - 2 of 2 reviews