Matrices Flashcards
1
Q
How do you compute matrices to the power T and what is it called?
A
- Switch the columns and rows
- Transpose
2
Q
How do you find the trace of square matrices?
A
Find the sum of the diagonal entries, top left to bottom right
3
Q
How do you find the determinant of a 2x2 matrix?
A
ad-bc
4
Q
How do you find inverse 2x2 matrices?
A
- 1/determinant of matrix
- multiplied by matrix with a and d switched and -b and -c
5
Q
How to compute 3x3 matrices inverse?
A
- 1/determinant
- multiplied by C transpose
6
Q
You are given A and B. How do you find X in AX=B?
A
X = A^-1B
7
Q
What is an identity matrix?
A
All the diagonal top left to bottom right entries are 1
