[Numpy-discussion] np.nonzero - order guarantees?

[Matthew Brett]

Hi,

`np.nonzero` for a 2D array `A` returns:

row_inds, col_inds = np.nonzero(A)

I notice that `row_inds` appears to be sorted by value, and `col_inds`
appears to be sorted by value, within each row.

Is this a guarantee of the `np.nonzero` function?  If not, does this
function guarantee any property of the returned indices, other than
the correspondence of the row, column entries?

Cheers,

Matthew