matrices matrices matrices.. oh how i didnt miss you!
this week was a review of multiplying/dividing/adding/subtracting matrices.
it was easy but it was aggravating because i knew how to do it. however, this does not mean that i want to learn harder stuff because then i wont bother to learn it because i wont feel like bothering with it. oh welll onn to the explanationss!
When you are multiplying matrices, the dimensions of both matrices have to have the same numbers in the middle. Also when multiplying matrices, you go row by column.
Ex. 2 x 2 2 x 2
If those two numbers match, then the two outer numbers will give you what the dimensions of the final matrix will be.
Ex. 3 x 2 2 x 3 - Now you will end up with a 3x3 matrix.
We also learned about Cramer's rule:
D stands for the determinant.
dx/d
dy/d
dz/d if there is one.
kaybye!
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