LogLimit:

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   Given a frequency vector, find the logarithm of the frequency
   limits that span the set.

   Since version 1.
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   Form:
   [logWMin, logWMax] = LogLimit( wV )
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   ------
   Inputs
   ------
   wV          Frequency vector

   -------
   Outputs
   -------
   logWMin     Log of the minimum frequency
   logWMax     Log of the maximum frequency

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