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Operations on Matrices: Outer Product
A outer
product between two vectors is calculated by multiplying each
element in one vector by each element in the other vector (see Figure
8). If the first vector has dimension d1 and the second
vector dimension d2, the outer product matrix has dimension
d1xd2. For instance, a three dimensional vector
multiplied by a two dimensional vector has dimension 3x2.
Figure 8: The outer product.
The outer product operation is expressed algebraically by placing the vectors
to be multiplied next to each other. So the outer product of v
and w is written as v w.