An Introduction to Python For Undergraduate Engineers/Matrices

Matrices can be created in the following way:

   mymatrix = Matrix([[1,2],[3,4]])

In this example, [1,2] produces the first line of the matrix and [2,3] creates the second.

Quick Standard Matrices[edit | edit source]

The following built in functions can be used to quickly create some standard matrices of specified size.

Command	Description	Example
`eye()`	Identity Matrix	`eye(4)` creates a 4x4 identity matrix
`zeros()`	Empty Matrix	`zeros(2,3)` creates a 2x3 matrix of zeros
`ones()`	Matrix of 1s	`ones(2)` creates a 2x2 matrix of ones

You can find out the size of a matrix using the .shape[] command, for example:

   mymatrix.shape[0]

Command	Description
.shape[0]	Gives number of rows
.shape[1]	Gives number of columns