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How to enter the R-square fit formula in the m-file?

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Priya
Priya 2014-2-15
编辑： Priya 2014-2-21
I need to calculate the R-square fit for the model output. I have the formula for calculating it, but how to give it in the code and what is the plot command to get the r-square fit?
Please do help me.

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Wayne King
Wayne King 2014-2-15
编辑：Wayne King 2014-2-15
Residual sum of squares
residsumsq = norm(y-yhat,2)^2;
Total sum of squares
tsumsq = norm(y-mean(y),2)^2;
R2 = 1-(tsumsq/residsumsq);
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Wayne King
Wayne King 2014-2-15
The y vector is the vector of your original data. The yhat vector is your fitted data as predicted by your model.
Priya
Priya 2014-2-21
编辑：Priya 2014-2-21
Please tell me what does the 2(in bold) in the below expression mean?
residsumsq = norm(y-yhat, 2 )^2;
Also, Is the norm function referring to summation?

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