Identity Matrix
Inverse Matrix
Product of a Matrix and a Vector
Rotations
Rotation-Dilations
Orthogonal Projections
Reflections
Determinant and Inverse of a 2x2 Matrix
Matrix ProductsHow to Examples Exercise
How to:
In Linear Algebra, the identity matrix is a square matrix with one's on the diagonal, and zero's everywhere else. We will learn later in our matrix multiplication section, why it is called this. To quickly form an identity matrix of any size in MATLAB type:
A = eye(number of rows (and columns) in matrix)
Examples:
To form a 10x10 identity matrix, we could tediously type out 10 rows of 10 numbers, remembering to put one's on the diagonal, or we could just type:
I = eye(10)
Exercise: