yablog: calculate cosine with python numpy

yablog: calculate cosine with python numpy

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


yablog: calculate cosine with python numpy


yablog: calculate cosine with python numpy


yablog: calculate cosine with python numpy

python code for calculating cosine

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import
numpy
 
def
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)
    
print
get_degrees_from_radian(radian)
 
if
__name__
=
=
"__main__"
:
    
main()

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