Date: Oct 11, 2012 7:35 AM
Author: text-dude
Subject: Matlab - RMS-value

Hi,

Is it correct that RMS can be calculated in two ways for my input vector 
"inVec" ?

  RMS1 = sqrt( mean(inVec)^2 + var(inVec) );
  RMS2 = sqrt( 1/length(inVec) * sum(inVec.^2) );


ans =

    58.8831

ans =

    58.8811


Why is there a difference ? Round-off error or something else ?

I suspect something else.