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In [2]: import numpy as np Operation In [4]: test_a = np.array([[1,2,3], [4,5,6]], float) In [6]: test_a + test_a #matrix + matrix Out[6]: array([[ 2., 4., 6.], [ 8., 10., 12.]]) In [8]: test_a - test_a #matrix - matrix Out[8]: array([[0., 0., 0.], [0., 0., 0.]]) In [10]: test_a * test_a #element 곱 연산 Out[10]: array([[ 1., 4., 9.], [16., 25., 36.]]) In [13]: matrix_a = np.arange(1, 13).reshape(3..

In [2]: import numpy as np In [4]: test_array = np.arange(1, 11) test_array Out[4]: array([ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) Sum In [6]: test_array.sum(dtype=np.float) Out[6]: 55.0 In [9]: test_array = np.arange(1, 13).reshape(3,4) test_array.sum() Out[9]: 78 In [12]: print(test_array) test_array.sum(axis=1) #칼럼끼리 더한다 [[ 1 2 3 4] [ 5 6 7 8] [ 9 10 11 12]] Out[12]: array([10, 26, 42]) In [14]: tes..