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UBOUND returns the upper bound (largest available subscript) for the
indicated dimension of an array.
 
UBOUND(array[,dimension%])
 
Usage Notes
    ■ The UBOUND function is used with the LBOUND function to determine
      the size of an array.
    ■ UBOUND returns the values listed below for an array with the
      following dimensions:
 
        DIM A(1 TO 100, 1 TO 3, -3 TO 4)
 
        Invocation     Value returned
        ═══════════    ══════════════
        UBOUND(A,1)    100
        UBOUND(A,2)      3
        UBOUND(A,3)      4
 
    ■ You can use the shortened syntax UBOUND(array) for one-dimensional
      arrays because the default value for dimension% is 1.
    ■ Use the LBOUND function to find the lower limit of an array
      dimension.