This week, on the few days we were not testing, we learned about matrices. It is a rather simple concept. I am going to talk about the addition of matrices.

-A^t means transpose. That simply means switch the rows and columns.

-To add matrices they must be the same dimensions (number of rows and columns)

-To complete scalar multiplication you multiply every entry by the number.

EXAMPE TIIIIIIIIIIIIME

M= [7 1 5]

[4 3 2]

A. What are the dimensions of the matrix?

2x3 ( There are two rows and three columns )

B. Find m^t

[4 7]

[3 1]

[2 5]

Example TWO:

Add the matrix from the last example and the matrix

[8 3 4]

[6 2 9]

Simply add the corresponding spots.

[7+8 1+3 5+4]

[4+6 3+2 2+9]

The answer would then be:

[15 4 9]

[10 5 11]

So that is how you work with matrices.

--Sarah (: