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sfaleron
/
ln2.py
Created
Sep 24, 2015
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Quick ln2 function for Python
Raw
ln2.py
from
math
import
ceil
# for example, inc=4 gives ln16, or the number of hexadecimal digits
# required to represent n.
def
ln2
(
n
,
inc
=
1
):
if
n
<
0
:
raise
ValueError
(
'math domain error'
)
i
=
0
n
=
int
(
ceil
(
n
))
while
n
:
i
+=
1
n
>>=
inc
return
i
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