Matrices Flashcards
1
Q
When describing a matrix size, what is m?
A
M is the number of rows
2
Q
When describing a matrix size, what is n?
A
N is the number of collumns
3
Q
How do you describe the size of a matrix?
A
m×n
4
Q
What is a zero matrix?
A
A matrix with only zeros in it
5
Q
What is a symmetric matrix?
A
> Square matrix
A^T = A
The elements are symmetrical about the diagonal
6
Q
What is the matrix that reflects the vector about the y-axis?
A
-1 0
0 1
7
Q
What is the matrix that reflects the vector about the x-axis?
A
1 0
0 -1
8
Q
What is the matrix that rotates a matrix vector clockwise by the angle ϕ?
A
cosϕ sinϕ
-sinϕ cosϕ
9
Q
What is the matrix the rotates the matrix vector anti-clockwise by the angle ϕ?
A
cosϕ sinϕ
-sinϕ cosϕ
