python plot matrix
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A correlation diagram can be created using Matplotlib. Matplotlib is the most used plotting library for Python. It can be included in all the graphical toolkits that are available for Python.
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Matrix definition
To start we define a 2x2 matrix and a list called groups. The matrix is defined inside the brackets (double [[ and ]] if written on a single line).

Visual:
Correlation using Matplotlib
Matrix correlation
The code below generates a Matrix correlation diagram using Matplotlib.

Initially we define the matrix (m) and the list (groups).
We set the length to be equal to the length of the groups. On the x axis and y axis we set the group names.
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