Why are these two RMSE yield different results?

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Raja Joko Musridho
评论： Raja Joko Musridho 2018-4-11
LM_error= sqrt(mean(((trueLm-estLm).^2),2));
LM_error= sqrt(sum(((trueLm-estLm).^2),2)/length(data));

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Image Analyst
Image Analyst 2018-4-8
编辑：Image Analyst 2018-4-8
Why should they be? The first method does not even use the array called data at all so it doesn't surprise me that they are different.
And why not simply use immse()?
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Image Analyst
Image Analyst 2018-4-10
Not necessarily, but sum(x)/length(x) IS the same as mean(x)?
Raja Joko Musridho
Raja Joko Musridho 2018-4-11
Thank you
But I am still wondering why the results I got are different to each other. The sum((trueLM-estLM).^2)/length(x)

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