How do I add multiple matrices in numpy?

Question

How do I combine all of these numpy arrays?

array([[0.00938241, 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.00902791, 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.00744846, 0.        , 0.        ,
        0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.00607864, 0.        ,
        0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.00508451,
        0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.        ,
        0.00731141, 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.00747849, 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.00603218, 0.        , 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        , 0.00502514, 0.        ,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        , 0.        , 0.00823613,
        0.        , 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        , 0.        , 0.        ,
        0.00828131, 0.        , 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.00833615, 0.        ],
       [0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.        , 0.        , 0.        ,
        0.        , 0.        , 0.0088979 ]])

I want to get

array([0.00938241, 0.00902791        , 0.00744846        , 0.00607864        , 0.00508451        ,
        0.00731141        ,...])

as my ouput i.e. I just want to sum them all up into one array. How do I do this with more than two arrays? I don't see any documentation that addresses this...

How did you even get this array? It looks like a 2D array with the data you want on the main diagonal. It's very likely that you did something wrong, or at least very suboptimal, while creating this array, and you should probably change the code that created it instead of trying to post-process the output. — user2357112
– user2357112, Commented Sep 30, 2019 at 1:35
A good starting point is trying to understand what you have. As pointed out this is one array (not many). Print arr.shape and arr.dtype. Then the task of adding rows or columns becomes clearer. Or getting the diagonal. — hpaulj
– hpaulj, Commented Sep 30, 2019 at 1:58

Dev Khadka · Accepted Answer · 2019-09-30 02:01:41Z

1

just do sum along axis 1

also use np.array instead of pd.Dataarray which is not defined

arr.sum(axis=1)

edited Sep 30, 2019 at 2:01

answered Sep 30, 2019 at 1:51

Dev Khadka

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1 Comment

Dev Khadka Over a year ago

it is same as the array is diagonal square

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