![Visualize a matrix in SAS by using a discrete heat map](https://blogs.sas.com/content/iml/files/2013/12/discheatmap3.png)
Visualize a matrix in SAS by using a discrete heat map
A heat map is a graphical representation of a matrix that uses colors to represent values in the matrix cells. Heat maps often reveal the structure of a matrix. There are three common applications of visualizing matrices with heat maps: Visualizing a correlation or covariance matrix reveals relationships between variables.