4
目的是计算距离矩阵两组点(set1
和set2
)之间,使用argsort()
以获得排序索引和take()
提取排序后的数组。我知道我可以直接做sort()
,但我需要下一步的索引。我正在使用花式索引concepts discussed here。我无法直接使用take()
与获得的索引矩阵,但添加到每一行的相应数量使其工作,因为take()
平整源数组使第二行元素索引+ = len(set2),第三行索引+ = 2 * LEN(设置2)等(见下文):使用NumPy的argsort并采取在2D阵列
dist = np.subtract.outer(set1[:,0], set2[:,0])**2
dist += np.subtract.outer(set1[:,1], set2[:,1])**2
dist += np.subtract.outer(set1[:,2], set2[:,2])**2
a = np.argsort(dist, axis=1)
a += np.array([[ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[10, 10, 10, 10, 10, 10, 10, 10, 10, 10],
[20, 20, 20, 20, 20, 20, 20, 20, 20, 20],
[30, 30, 30, 30, 30, 30, 30, 30, 30, 30]])
s1 = np.sort(dist,axis=1)
s2 = np.take(dist,a)
np.nonzero((s1-s2)) == False
#True # meaning that it works...
的主要问题是:有没有使用take()
没有这些指标相加直接的方式?
set1 = np.array([[ 250., 0., 0.],
[ 250., 0., 510.],
[-250., 0., 0.],
[-250., 0., 0.]])
set2 = np.array([[ 61.0, 243.1, 8.3],
[ -43.6, 246.8, 8.4],
[ 102.5, 228.8, 8.4],
[ 69.5, 240.9, 8.4],
[ 133.4, 212.2, 8.4],
[ -52.3, 245.1, 8.4],
[-125.8, 216.8, 8.5],
[-154.9, 197.1, 8.6],
[ 61.0, 243.1, 8.7],
[ -26.2, 249.3, 8.7]])
其他相关问题:
数据一起玩
- Euclidean distance between points in two different Numpy arrays, not within