LBOUND

lb = LBOUND (array [, dim])

Returns the lower bound lb of an array array. dim can be used to specify, at which dimension the lower bound should be returned if array is a multi-dimensional array. If dim is not used the lower bound of the first dimension will be returned.

See UBOUND for upper bound of an array.

Example 1: Lower bound of one-dimensional arrays

dim A(5)
dim B(5 to 10)

print lbound(A)     ' Output: 0
print lbound(B)     ' Output: 5

Example 2: Lower bound of multi-dimensional arrays

dim A(5,6,7)
dim B(5 to 10, 7 to 12, 9 to 14)

print lbound(A, 2)     ' Output: 0
print lbound(B, 2)     ' Output: 7

Example 3: Using option base 1

option base 1

dim A(5)
dim B(5 to 10)

print lbound(A)     ' Output: 1
print lbound(B)     ' Output: 5