March 2004
Beginner
504 pages
9h 2m
English
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Matrix Multiplication
The preceding section looked at multiplying a scalar and a matrix. The next logical step is to investigate the product of two matrices, or a matrix times another matrix. This process involves the dot product, so you might want to flip back to Chapter 4, “Vector Operations,” for a quick review of the dot product before proceeding.
You can multiply matrices by taking a series of dot products. Keep in mind two important aspects of the dot product:
The two vectors must have the same number of entries to take the dot product.
The dot product returns a scalar quantity (a single number).
Let's start by looking at two 2×2 matrices. Matrices to be multiplied don't have to be square and don't have to be the same size, but there are ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.