python-numpyHow to sort Numpy array by column
import numpy as np
a = np.array([[3, 1], [4, 2], [5, 7]])
sorted = np.sort(a.view('i8,i8'), order=['f0'], axis=0).view(np.int)ctrl + cimport numpy as npload Numpy module for Python | np.arraydeclare Numpy array |
np.sortsort specified array with specified parameters | a.view('i8,i8')creates a view of |
order=['f0']will sort given structured array by first column (use | axis=0sort array vertically |
view(np.int)convert given view back to 2-dimensional array of integers | |
Usage example
import numpy as np
a = np.array([[3, 1], [4, 2], [2, 7]])
print(a)
sorted = np.sort(a.view('i8,i8'), order=['f0'], axis=0).view(np.int)
print(sorted)output
[[3 1]
[4 2]
[2 7]]
[[2 7]
[3 1]
[4 2]]
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