Why using the formula of R-square from Matlab help cannot get the same value as Matlab curve fitting tool？

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Miranda Zhang
Miranda Zhang el 5 de Mayo de 2015
Comentada: Ahmet Cecen el 5 de Mayo de 2015
When I use the curve fitting tool of Matlab, after the regression, a R-square will always be given. However, I checked the "help" of Matlab about this charpter and get the following formulas:
but when I use script to verify, I got different values from my test script and the Matlab cftool.
Can anyone help me with it ??!!

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