undefined function or variable RMSE

Hi guys,

I am trying to plot RMSE, rsquared and qqplot, but I keep getting error,

'undefined function or variable RMSE'

I am currently using 2017 MATLAB version

[Walter Roberson]

RMSE is not a function defined by MATLAB. I also do not see any function by that name in any File Exchange contributions (but I might have overlooked one.) There is an rmse (lower-case) in the File Exchange.

I find some places in MATLAB where there are properties named RMSE and Rsquared and I find some papers and third-party toolkits that deal with Rsquared or rsquared, but at this time I do not find any rSquared.

I think you are using either a third-party toolbox or something provided by a professor, not part of MATLAB.

[Niraj Acharya]

Are ther any functions to compute RMSE and rsquared of a regression model? Actually, I saw my instructor use RMSE and rsquared in his script, but I cannot use it for myself?

[Walter Roberson]

Which kind of regression model?

https://www.mathworks.com/help/stats/assess-model-performance-in-regression-learner.html

https://www.mathworks.com/help/stats/linearmodel.html has RMSE and Rsquared properties

[Rik]

And if you have fitted data and true data, you can use minus to calculate the error, then use sqrt(mean(err^2)) which is what RMSE stands for.