Vectors

One dimensional arrays
A single column matrix is called a column vector
A single row matrix is called a row vector

Row and Column Vectors

Dim aMyArray As Variant 
aMyArray = Range("A1:B1")    'row vector  
aMyArray(1,1) = 1 
aMyArray(1,2) = 2 

Dim aMyArray As Variant 
aMyArray = Range("A1:A2")    'column vector  
aMyArray(1,1) = 1 
aMyArray(2,1) = 2 

Dim aMyArray(1 to 2) As Integer 
aMyArray(0) = 1 
aMyArray(1) = 1 
aMyArray(2) = 1 

This will create a row vector by default