Limit:

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   Limits a matrix. 
   If limit is a scalar then the limits are set at plus or minus the 
   limit.

   Since version 1.
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   Form:
   x = Limit( x, limit )
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   Inputs
   ------
   x                      Vector to be quantized
   limit          (2)     Limit values [max,min]
   

   -------
   Outputs
   -------
   x                      x limited to be between the limits.

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