sort array python by column
Sorting a NumPy array by a column orders its rows based on the ordering of the values in the column. For example, sorting the array [[8 2 -2] [-4 1 7] [6 3 9]] by its second column returns [[-4 1 7] [8 2 -2] [6 3 9]]. USE numpy.args sorted_array = an_array[numpy.argsort(an_array[:, 1])]