python - ValueError: operands could not be broadcast together with shapes (51,51) (100,) -

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im trying assigment, error: valueerror: operands not broadcast shapes (51,51) (100,)

def get_velocity(strength, xs, ys, x, y,):  u = strength /(2*np.pi)*(x-xs)/((x-xs)**2 +(y-ys)**2) v = strength /(2*np.pi)*(y-ys)/((x-xs)**2 +(y-ys)**2)  return u, v

i want use function given points

x_naca0012 = np.loadtxt('naca0012_x.txt')  y_naca0012 = np.loadtxt('naca0012_y.txt')  strength_naca0012 = np.loadtxt('naca0012_sigma.txt')

using function: 

u_naca0012, v_naca0012 = get_velocity(strength_naca0012, x_naca0012, y_naca0012, x, y)

here goes wrong, search error , find not matching arrays, checked lengths of each array , match (100). noticed 50th element of naca0012_y positive value , 51th element negative value. think messes there.


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