Last Updated 10/28/2022

Sage Essentials
Section 7: Matrix Manipulations

In this section we will learn the commands you need for a typical Linear Algebra course.

Matrices

Example 1

To define a matrix in SageMath, we list the rows of the matrix with the matrix command. For example, let us define the matrix $A=\left[\begin{array}{cc}1& 2\\ -1& 1\end{array}\right]$.

Try this!

Define the $4\times 4$  identity matrix  $I=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]$.