Try starting with an extended-precision value: f0b 98x 135301852344706746049 f2a 98 NB. not needed here 135301852344706746049
If you apply extended precision after-the-fact, the intermediate calculations will all be performed on floating-point numbers, which is where the precision loss happens.
On Sat, 25 Sep 2021, Skip Cave wrote:
From: https://code.jsoftware.com/wiki/Essays/Fibonacci_Sequence f0b=: (-&2 +&$: -&1) ^: (1&<) M. f2a=: 3 : '{. +/\@|.^:y 0 1x' x:f0b 98 135301852344706760704 x:f2a 98 135301852344706746049 (x:f0b 98) -: x:f2a 98 0 Why the discrepancy? Skip Skip Cave Cave Consulting LLC ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
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