What is matrix multiplication operator in python?
2017 will forever be etched in our memories as the year Python overtook R to become the leading language for Data Science. There are many factors that play into this: Python's simple syntax, the fantastic PyData ecosystem, and of course buy-in from Python's BDFL. PEP 465 introduced the I was a Computational Mathematics major in college so matrices are very near and dear to my heart. Shoutout to Professor Jeff Orchard for having us implement matrix algorithms in C++. His Numerical Linear Algebra course was the best class I've ever taken. In this post, we will explore the In [2]: A = np.matrix('3 1; 8 2') A In [3]: B = np.matrix('6 1; 7 9') B Out[4]: matrix([[25, 12], [62, 26]]) In [5]: # element at the top left. i.e. (1, 1) aka (0, 0) in python A[0, 0] * B[0, 0] + A[0, 1] * B[1, 0] In [6]: # element at the top right. i.e. (1, 2) aka (0, 1) in python A[0, 0] * B[0, 1] + A[0, 1] * B[1, 1] In [7]: # element at the bottom left. i.e. (2, 1) aka (1, 0) in python A[1, 0] * B[0, 0] + A[1, 1] * B[1, 0] In [8]: # element at the top right. i.e. (2, 2) aka (1, 1) in python A[1, 0] * B[0, 1] + A[1, 1] * B[1, 1] In [9]: # let's put it in matrix form result = np.matrix([[A[0, 0] * B[0, 0] + A[0, 1] * B[1, 0], A[0, 0] * B[0, 1] + A[0, 1] * B[1, 1]], [A[1, 0] * B[0, 0] + A[1, 1] * B[1, 0], A[1, 0] * B[0, 1] + A[1, 1] * B[1, 1]]]) result Out[9]: matrix([[25, 12], [62, 26]]) Out[10]: matrix([[ True, True], [ True, True]], dtype=bool) The
Python Data Model specifies that the We can overload
Which operator is used for matrix multiplication?The multiplication operator * is used for multiplying a matrix by scalar or element-wise multiplication of two matrices.
What is the symbol for matrix multiplication?Symbolic matrix multiplication - MATLAB mtimes *
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