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function y = rms(x, dim) %RMS Root mean squared value. % For vectors, RMS(X) is the root mean squared value in X. For matrices, % RMS(X) is a row vector containing the RMS value from each column. For % N-D arrays, RMS(X) operates along the first non-singleton dimension. % % Y = RMS(X,DIM) operates along the dimension DIM. % % When X is complex, the RMS is computed using the magnitude % RMS(ABS(X)). % % % Example #1: RMS of sinusoid vector % x = cos(2*pi*(1:100)/100); % y = rms(x) % % % Example #2: RMS of columns of matrix % x = [rand(100000,1) randn(100000,1)]; % y = rms(x, 1) % % % Example #3: RMS of rows of matrix % x = [2 -2 2; 3 3 -3]; % y = rms(x, 2) % % See also MIN, MAX, MEDIAN, MEAN, STD, PEAK2RMS. % Copyright 2011 The MathWorks, Inc. %#codegen if nargin==1 y = sqrt(mean(x .* conj(x))); else y = sqrt(mean(x .* conj(x), dim)); end