3 ms·
There is something strange with the example. $ pypy -mtimeit -s'import math; sin=math.sin' \ '[x*x+sin(x/1e6) for x in xrange(1000000)]' 10 loops, be
by d0mine 16y ago
There is something strange with the example.
$ pypy -mtimeit -s'import math; sin=math.sin' \
'[x*x+sin(x/1e6) for x in xrange(1000000)]'
10 loops, best of 3: 156 msec per loop
With no division it is slower (?):
$ pypy -mtimeit -s'import math; sin=math.sin' \
'[x*x+sin(x) for x in xrange(1000000)]'
10 loops, best of 3: 188 msec per loop
CPython shows expected behavior:
$ python2.7 -mtimeit -s'import math; sin=math.sin' \
'[x*x+sin(x) for x in xrange(1000000)]'
10 loops, best of 3: 231 msec per loop
$ python2.7 -mtimeit -s'import math; sin=math.sin' \
'[x*x+sin(x/1e6) for x in xrange(1000000)]'
10 loops, best of 3: 253 msec per loop
CPython is faster for tiny cases:
$ pypy -mtimeit '[x*x for x in xrange(1000000)]'
10 loops, best of 3: 126 msec per loop
$ python2.7 -mtimeit '[x*x for x in xrange(1000000)]'
10 loops, best of 3: 67.3 msec per loop
$ pypy -mtimeit '[x*x*x for x in xrange(1000000)]'
10 loops, best of 3: 123 msec per loop
$ python2.7 -mtimeit '[x*x*x for x in xrange(1000000)]'
10 loops, best of 3: 118 msec per loop
- orangecat 16y agoWith no division it is slower (?) Very interesting. Looks like sin is faster for arguments less than pi/4 (~=0.7853981633974483): Edit: "Intel's sin/cos implementation sucks golfballs through gardenhoses for arguments outside of [-pi/4,pi/4]": http://stackoverflow.com/questions/523531/fast-transcendent-trigonometric-functions-for-java http://stackoverflow.com/questions/523531/fast-transcendent-... $ pypy -mtimeit -s'import math; sin=math.sin; a=0.786' '[sin(a) for x in xrange(1000000)]' 10 loops, best of 3: 395 msec per loop $ pypy -mtimeit -s'import math; sin=math.sin; a=0.785' '[sin(a) for x in xrange(1000000)]' 10 loops, best of 3: 375 msec per loop $ python -mtimeit -s'import math; sin=math.sin; a=0.786' '[sin(a) for x in xrange(1000000)]' 10 loops, best of 3: 177 msec per loop $ python -mtimeit -s'import math; sin=math.sin; a=0.785' '[sin(a) for x in xrange(1000000)]' 10 loops, best of 3: 155 msec per loop