June 8, 2018
6:34 a.m.
Stephen J. Turnbull wrote:
Since Pi is irrational, Pi/4 is too, so it definitely cannot be represented. Making a correction to a number that "looks like" Pi/4 is against this philosophy.
I'm not sure what all the fuss is about:
from math import pi, sin sin(pi/2) 1.0 sin(pi/2 + 2 * pi) 1.0 sin(pi/2 + 4 * pi) 1.0 sin(pi/2 + 8 * pi) 1.0 sin(pi/2 + 16 * pi) 1.0 sin(pi/2 + 32 * pi) 1.0
Seems to be more than good enough for most angle ranges that your average schoolkid is going to be plugging into it. In fact you have to go quite a long way before expectations start to break down:
sin(pi/2 + 10000000 * pi) 1.0 sin(pi/2 + 100000000 * pi) 0.9999999999999984
-- Greg