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How to calculate the sum of every row in a NumPy array in ...

arr = np.array([ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]). newarr = arr.reshape( 4 , 3 ). print (newarr). column_sums = newarr. sum (axis = 1 ).

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