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LBOUND returns the lower bound (smallest available subscript) for the
indicated dimension of an array.
 
LBOUND(array[,dimension%])
 
Usage Notes
    ■ The LBOUND function is used with the UBOUND function to determine
      the size of an array.
    ■ LBOUND returns the values listed below for an array with the
      following dimensions:
 
      DIM A(1 TO 100, 0 TO 3, -3 TO 4)
 
        Invocation     Value Returned
        ═══════════    ══════════════
        LBOUND(A,1)     1
        LBOUND(A,2)     0
        LBOUND(A,3)    -3
 
    ■ The default lower bound for any dimension is either 0 or 1, depending
      on the setting of the OPTION BASE statement. If OPTION BASE is 0, the
      default lower bound is 0, and if OPTION BASE is 1, the default lower
      bound is 1.
    ■ Arrays dimensioned using the TO clause in the DIM statement can have
      any integer value as a lower bound.
    ■ You can use the shortened syntax LBOUND(array) for one-dimensional
      arrays, because the default value for dimension% is 1.