Ruud H.G. van Tol on Sat, 14 Dec 2024 12:07:36 +0100


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digits of a float 


How to properly isolate a digit of a float?


Example:

? my(n=19437); localprec(n+2); Pi *10^(n-1) \1 %10
%4 = 7

? my(n=19437); localprec(n+3); Pi *10^(n-1) \1 %10
%5 = 6
That type of code depends on the number of 9-digits in the decimal expansion of the value. 

See also https://oeis.org/A000796, which uses localprec(n*6\5+29).

What clean ways are there?

-- Ruud