Version 1.3.0.1

Updated documentation about code origin.

Version 1.3.0.0

This release version 1.3.0.0 improves on Zachary Danziger's version 1.2.0.0 on File Exchange in the following ways:

• Avoid the dependency on the Statistics Toolbox.
• Restructured input and output parameters.
• Explicitly omit identical x coordinates.
• Add the coefficient of determination (unadjusted R²) as optional output.