NQuant:

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   Computes the variance of various types of roundoff.
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   Form:
   [v, m] = NQuant( lSB, rType )
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   ------
   Inputs
   ------
   lSB                Least significant bit
   rType              'round','truncate' Default is 'round' 

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   Outputs
   -------
   v                  Variance ( sigma^2 ) 
   m                  Mean           

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