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what does it do/mean?

 Nov 19, 2018
 #1
avatar+101771 
+2

Maybe you mean

 

\(\begin{bmatrix} 3 && 1 && 3 \\ \end{bmatrix} \cdot \begin{bmatrix} 2\\ 3 \\4 \end{bmatrix} =\begin{bmatrix} 3*2+1*3+3*4 \end{bmatrix}=\begin{bmatrix} 21 \end{bmatrix}\)

 

See here for Matrix Multiplication

https://goo.gl/qVkz5B

 Nov 19, 2018
 #2
avatar+101431 
+1

Thanks, Melody....

 

This could also indicate that we want to take the dot product of the vectors

 

(3, 1, 3)   and ( 2, 3, 4)   =

 

We just multiply  like components and add these products....so we have

 

3*2  + 1*3  + 3*4   =

 

6   +  3   +   12  =

 

21

 

 

cool cool cool

 Nov 19, 2018

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