# How to calculate mean square error between points?

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studentmatlaber il 2 Mar 2022
Hello everyone. Here I want to calculate the mean square error between the blue dots and the red dot. I'm putting the files. I can't form in my head how to do it. I would be glad if you help.
scatter(reshape(x_T_est1(all(x_T_est1,2),:), [1,numel(x_T_est1(all(x_T_est1,2),:))]), reshape(y_T_est1(all(y_T_est1,2),:), [1,numel(y_T_est1(all(y_T_est1,2),:))]), 'b', 'x'); hold on;
scatter(x_T, y_T, 'r', 'filled');
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### Risposta accettata

David Hill il 2 Mar 2022
Modificato: David Hill il 2 Mar 2022
b=[reshape(x_T_est1(all(x_T_est1,2),:),[1,numel(x_T_est1(all(x_T_est1,2),:))]);...
reshape(y_T_est1(all(y_T_est1,2),:),[1,numel(y_T_est1(all(y_T_est1,2),:))])]';
b=b(~isnan(b(:,1))&~isnan(b(:,2)),:);%you have some NANs in your arrays.
r=[x_T,y_T];
meanSquaredError=sum((b-r).^2)/length(b);
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David Hill il 2 Mar 2022
If your scatter plot is working, then the above code should work. I tried in on your attached files (except y_T_est1 not provide, so I set it equal to x_T_est1) and it worked. Not sure what you want to do with the nan values.
studentmatlaber il 6 Mar 2022
thank you

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