matlab - find RMS value in frequency domain -

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I want to find RMS values ​​in frequency domain, I used to help this site

But it is calculated using FFT, but if I am using periodgram instead of this code 

  X = fft (x) Parsvell's Theorem The amount (x ^ 2) = (bay (x) (x) (x) (x) (x) (x) / ex> 
 How does the code change in terms of time? Thanks in advance   
 
 
 chronology  p = p (f)  expresses how the power of a signal  x = x (t)  It is distributed in various frequencies, such that it can be seen as a function which is an instance of the full value of the Fourier conversion evaluated at  x   Code> f  code>. 
 
 In other words, the time table for  x = x (t)  in the context of your notation  P (f) = | X ^ ^ 2 (f). ) . 
 
 As a result,  rms  satisfies 
 
  RMS = sqrt (amount (p)) / n  
 
 
  CAVEAT:  
 
 I am not quite convinced about your generalization factors. In theory, in the theory of Parsvell it has been said that Fourier Transform is the isometric isomorphism of  L ^ 2  on itself. Therefore, Fourier conversion is done, so the model of the signal is preserved. However, due to different definitions of such changes, there may be various common factors (eg, your  1 / N ). In essence, that static should pay attention.

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