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calculate angle between two vectors

/ Published in: Python
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  1. def dotproduct(a,b):
  2. 	return sum([a[i]*b[i] for i in range(len(a))])
  3.  
  4. from math import acos
  5.  
  6. #Calculates the size of a vector
  7. def veclength(a):
  8. 	return sum([a[i] for i in range(len(a))])**.5
  9.  
  10. #Calculates the angle between two vector
  11. def ange(a,b):
  12. 	dp=dotproduct(a,b)
  13. 	la=veclength(a)
  14. 	lb=veclength(b)
  15. 	costheta=dp/(la*lb)
  16. 	return acos(costheta)

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