greatest_power_of_two_less_equal

abjad.mathtools.greatest_power_of_two_less_equal.greatest_power_of_two_less_equal(n, i=0)

Gets greatest integer power of two less than or equal to positive n.

>>> for n in range(10, 20):
...     print('\t%s\t%s' % (n, abjad.mathtools.greatest_power_of_two_less_equal(n)))
...
10 8
11 8
12 8
13 8
14 8
15 8
16 16
17 16
18 16
19 16

Greatest-but-i integer power of 2 less than or equal to positive n:

>>> for n in range(10, 20):
...     print('\t%s\t%s' % (n, abjad.mathtools.greatest_power_of_two_less_equal(n, i=1)))
...
10 4
11 4
12 4
13 4
14 4
15 4
16 8
17 8
18 8
19 8

Returns positive integer.