python - Check that all rows in numpy array are unique -


i have 4 column array:

a=array([[100,1,500,1],          [100,1,501,1],          [101,1,501,1],          [102,2,502,2],          [500,1,100,1],          [100,1,500,1],          [502,2,102,2],          [502,1,102,1]])

i want extract rows unique (or first occurrence) , rows such row i, there no other rows j in array a[i,:]==a[j,[2,1,0,3]] (or first occurrence).

so array a, array looks like:

b=array([[100,1,500,1],          [100,1,501,1],          [101,1,501,1],          [102,2,502,2],          [502,1,102,1]])

thank help!

a[np.unique(np.sort(a,1).view("int, int, int, int"), return_index=true)[1]]

in steps:

in [385]: out[385]:  array([[100,   1, 500,   1],        [100,   1, 501,   1],        [101,   1, 501,   1],        [102,   2, 502,   2],        [500,   1, 100,   1],        [100,   1, 500,   1],        [502,   2, 102,   2],        [502,   1, 102,   1]])

we can eliminate need swapping columns 0 , 2 (the thing a[i] = a[j, [2,1,0,3]) sorting each row. don't have worry swapping columns 1 , 3, since rows in a, have column 1 equals column 3: a[:, 1] == a[:, 3].

in [386]: = np.sort(a,1)  in [387]: out[387]:  array([[  1,   1, 100, 500],        [  1,   1, 100, 501],        [  1,   1, 101, 501],        [  2,   2, 102, 502],        [  1,   1, 100, 500],        [  1,   1, 100, 500],        [  2,   2, 102, 502],        [  1,   1, 102, 502]])

find unique rows in as (the sorted array). view structured array each row single element (since np.unique otherwise flatten array first)

in [388]: as.view('int, int, int, int') out[388]:  array([[(1, 1, 100, 500)],        [(1, 1, 100, 501)],        [(1, 1, 101, 501)],        [(2, 2, 102, 502)],        [(1, 1, 100, 500)],        [(1, 1, 100, 500)],        [(2, 2, 102, 502)],        [(1, 1, 102, 502)]],        dtype=[('f0', '<i8'), ('f1', '<i8'), ('f2', '<i8'), ('f3', '<i8')])  in [389]: u, = np.unique(as.view('int, int, int, int'), return_index=true)  in [390]: out[390]: array([0, 1, 2, 7, 3])

and use them rows unique in as original array a:

in [391]: a[i] out[391]:  array([[100,   1, 500,   1],        [100,   1, 501,   1],        [101,   1, 501,   1],        [502,   1, 102,   1],        [102,   2, 502,   2]])

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