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

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

Getting the Size of a Matrix

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