mirror of https://github.com/pyodide/pyodide.git
15 lines
633 B
Python
15 lines
633 B
Python
#setup: N = 10000 ; import numpy as np ; t0, p0, t1, p1 = np.random.randn(N), np.random.randn(N), np.random.randn(N), np.random.randn(N)
|
|
#run: arc_distance(t0, p0, t1, p1)
|
|
|
|
#pythran export arc_distance(float64 [], float64[], float64[], float64[])
|
|
|
|
import numpy as np
|
|
def arc_distance(theta_1, phi_1,
|
|
theta_2, phi_2):
|
|
"""
|
|
Calculates the pairwise arc distance between all points in vector a and b.
|
|
"""
|
|
temp = np.sin((theta_2-theta_1)/2)**2+np.cos(theta_1)*np.cos(theta_2)*np.sin((phi_2-phi_1)/2)**2
|
|
distance_matrix = 2 * (np.arctan2(np.sqrt(temp),np.sqrt(1-temp)))
|
|
return distance_matrix
|