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Code for calculating root mean squared error for data

from Code for calculating root mean squared error for data by Kamlesh Pawar
This is a simple code which accurately calculates RMS error for real or complex data.

[er]=rms_error(A1,A2) 
function [er]=rms_error(A1,A2)
% A1, A2 : Matrices of same size MxN
% er : Rms error
% Author : Kamlesh Pawar

if (size(A1)~= size(A2))
    display('Matrix dimension mismatch while calculating RMS value');
    return;
end

er = sum((A1(:)-A2(:)).^2);

er=sqrt(er/size(A1(:),1));
end

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