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Let's say I have array:

a = np.array([[9, 2, 3],
       [1, 2, 3]])

I want output:

[[2, 3, 9],
 [2, 3, 1]]

Basically, I want to sort the first row and I want the rest of the rows to follow their sorted counterparts

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You could try subscripting a on columns using sort positions of the first row:

a = a[:,a[0].argsort()]
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