Hi I needed a function f(x) which looks like sinus(2pi.x) but faster. I wrote this one:
-------------------------- from math import floor def sinusLite(x): x = x - floor(x) return -16*(x-0.25)**2 + 1 if x < 0.5 else 16*(x-0.75)**2 - 1 -------------------------- then i used module timeit to compare its execution time with math.sin() I put the sinusLite() function in a module named test. then:
import timeit t1 = timeit.Timer("y=test.sinusLite(0.7)", "import test") t2 = timeit.Timer("y=math.sin(4.39)", "import math") ## 4.39 = 2*pi*0.7
t1.repeat(3, 1000000)
[1.9994622221539373, 1.9020670224846867, 1.9191573230675942]
t2.repeat(3, 1000000)
[0.2913627989031511, 0.2755561810230347, 0.2755186762562971] so the genuine sinus is much faster than my so simple sinLite() ! Amazing isnt it ? Do you have an explanation ? Thx -- https://mail.python.org/mailman/listinfo/python-list
