yablog: calculate cosine with python numpy
calculate cosine with python numpy
purpose
Calculate “cosine” determined by pair of vectors using python and its package named numpy. Firstly I show you the definition of cosine in linear space, and Secondly I share sample python code for calculating cosine.
definition of cosine in linear space
python code for calculating cosine
import
numpydef
get_cosine(v1, v2):
""" calculate cosine and returns cosine """
n1
=
get_norm_of_vector(v1)
n2
=
get_norm_of_vector(v2)
ip
=
get_inner_product(v1, v2)
return
ip
/
(n1
*
n2)def
get_inner_product(v1, v2):
""" calculate inner product """
return
numpy.dot(v1, v2)def
get_norm_of_vector(v):
""" calculate norm of vector """
return
numpy.linalg.norm(v)def
get_radian_from_cosine(cos):
return
numpy.arccos(cos)def
get_degrees_from_radian(cos):
return
numpy.degrees(cos)def
main():
v1
=
numpy.array([
1
,
0
])
v2
=
numpy.array([
1
, numpy.sqrt(
3
)])
cosine
=
get_cosine(v1, v2)
radian
=
get_radian_from_cosine(cosine)
get_degrees_from_radian(radian)if
__name__
=
=
"__main__"
:
main()
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