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      Units are internally converted to km, rad, and sec.  The only
      valid inputs for units are [ m, km, mile, rad, deg, sec, min, hour ].

      The field UnitDbl.value will contain the converted value.  Use
      the convert() method to get a specific type of units back.
      
      = ERROR CONDITIONS
      - If the input units are not in the allowed list, an error is thrown.

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      - value    The numeric value of the UnitDbl.
      - units    The string name of the units the value is in.
      ii
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      = ERROR CONDITIONS
      - If the input units are not in the allowed list, an error is thrown.

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      = RETURN VALUE
      - Returns the value of the UnitDbl in the requested units as a floating
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      = RETURN VALUE
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Compare two UnitDbl's.

      = ERROR CONDITIONS
      - If the input rhs units are not the same as our units,
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      = RETURN VALUE
      - Returns -1 if self < rhs, 0 if self == rhs, +1 if self > rhs.
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Add two UnitDbl's.

      = ERROR CONDITIONS
      - If the input rhs units are not the same as our units,
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      = INPUT VARIABLES
      - rhs    The UnitDbl to add.

      = RETURN VALUE
      - Returns the sum of ourselves and the input UnitDbl.
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Subtract two UnitDbl's.

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      = RETURN VALUE
      - Returns the difference of ourselves and the input UnitDbl.
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      - rhs    The scalar to multiply by.

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      = INPUT VARIABLES
      - start    The starting value of the range.  
      - stop     The stop value of the range.  
      - step     Optional step to use.  If set to None, then a UnitDbl of
                 value 1 w/ the units of the start is used.
                 
      = RETURN VALUE
      - Returns a list contianing the requested UnitDbl values.
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      = ERROR CONDITIONS
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        an error is thrown.

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      - rhs    The UnitDbl to check for the same units
      - func   The name of the function doing the check.
      s3Cannot %s units of different types.
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