LogBaseN:

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   log of base n.

   The demo solves the problem log base 4 of 2.

   Since version 10.
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   Form:
   y = LogBaseN(n,x)
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   ------
   Inputs
   ------
   n     (1,1)      Base
   x     (1,:)      Number

   -------
   Outputs
   -------
   y     (1,:)      log base n of x

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