yablog: calculate cosine with python numpy

 
 python code for calculating cosine
         
     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()