# Vectors

Use this property to specify the variable length vector and the vector of known length.

If the row you are editing represents a
column which is a variable length vector, tick the **Variable** check
box. The Vector properties appear, these give the size of the vector
in one of two ways:

**Link Field Reference**. The name of a column containing the number of elements in the variable length vector. This should have an integer or float type, and have its Is Link field property set.**Vector prefix**. Specifies 1-, 2-, or 4-byte prefix containing the number of elements in the vector.

If the row you are editing represents a column
which is a vector of known length, enter the number of elements in
the **Vector** **Occurs** box.