I have a fairly simple question about how to sort an entire array/recarray by a given column. For example, given the array:
import numpy as np
data = np.array([[5,2], [4,1], [3,6]])
I would like to sort data by the first column to return:
array([[3,6], [4,1], [5,2]])
Use data[np.argsort(data[:, 0])] where the 0 is the column index on which to sort:
In [27]: import numpy as np
In [28]: data = np.array([[5,2], [4,1], [3,6]])
In [29]: col = 0
In [30]: data=data[np.argsort(data[:,col])]
Out[30]:
array([[3, 6],
[4, 1],
[5, 2]])