How to add D data read array (column) to 2_d array as a row

For instance:

I am reading 2 Voltages and 2 currents in real time (per second) as follows and getting an array as follows:

120.3

120.5

5.2

5.0

I would like to insert this column as a row into an array of previously measured data as follows:

....

xxxxx   xxxx   xxx   xxx      <-------(previously measured data)

xxxxx   xxxx   xxx   xxx      <-------(previously measured data)      

120.3   120.5   5.2    5.0      <------- New Data

any help would be great thanks :)