Like a similarity matrix, a correlation matrix compares two things and the relationship between them. Correlation matrices can compare how well two things correlate. For example, this particular correlation matrix shows the correlation between two things, but it doesn't list what it is comparing. A correlation means a mutual relationship between two or more things; however, no two things can ever have a 100% correlation. Therefore, the legends shows a correlation between -.66 and .95. This correlation matrix was taken from http://www.geocities.com/somesoftware/correlation_matrix.jpg.
This is a nice piece of work. I may call this correlation "visual correlation". Interesting, indeed
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