1. power(x1, x2)
Raise each element in x1 to the power of x2. Does not change the shape on x1.
2. sum(a, axis=None, dtype=None, out=None, keepdims=False)
To sum a, if axis=None, add up each number in the matrix, if axis=0, add the matrix column by column, if axis is greater than 0, add the matrix by row.
dtype defines the type of output.
out: Customize the matrix that stores the output results, and the shape must be the same as the output.
3. tile(A, reps)
With A as the element, construct a matrix with reps as shap.
例tile([1 2],[3,4])
The output is [1 2 1 2 1 2 1 2
1 2 1 2 1 2 1 2
1 2 1 2 1 2 1 2]
4. transpose(A)
Do the transpose of matrix A.
5.shape(A)
Returns the degrees of each dimension of A.
6. mat (A)
Converting A to matrix, the difference between matrix and array is that matrix must be 2-dimensional, while array can be multi-dimensional.
7.dot(A,B)
Do matrix multiplication of matrices A and B.
Reprinted in: https://blog.csdn.net/juanjuan1314/article/details/53282579