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SET_MVALUE()                                                       T_EXAM17
   Sets a value as missing.

   Syntax
         nValue = SET_MVALUE([nValue])

   Arguments
         OPTIONAL PARAMETERS
         nValue      Determines the value that will be skipped when drawing
                     lines.

   Returns
         nValue      Returns the value that is to be skipped.

   Description
         A value can be set as missing. When the lines are drawn, the values
         in the buffer that are the same as, less than, or greater than the
         missing value will not be plotted. The type parameter in SET_MISS()
         determines whether the buffer values are excluded from the plot if
         they are equal to, greater than or less than the value set with
         SET_MVALUE(). Missing values work with PLOT(), PIE(), SPLINE(),
         and REGRESS() functions.