An example of how shape calculates a matrix in Python
- 2020-05-30 20:28:17
The example in this paper describes the method of shape to calculate the matrix in Python. I will share it with you for your reference as follows:
When you look at machine learning algorithms, you notice that shape computes matrices and I'm going to tell you what I understand
>>> from numpy import * >>> import operator >>> a =mat([[1,2,3],[5,6,9]]) >>> a matrix([[1, 2, 3], [5, 6, 9]])
>>> shape(a) (2, 3) >>> a.shape # Calculate number of lines 2 >>> a.shape # Calculate the number of columns 3
Here is the explanation in Python
Examples -------- >>> np.shape(np.eye(3)) (3, 3) >>> np.shape([[1, 2]]) (1, 2) >>> np.shape() (1,) >>> np.shape(0) () >>> a = np.array([(1, 2), (3, 4)], dtype=[('x', 'i4'), ('y', 'i4')]) >>> np.shape(a) (2,) >>> a.shape (2,)
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I hope this article is helpful to you Python programming.