Interpolation on two axis in Mathcad 15

Dear all,

I have a (example) table like this:

    |  1  |   2  |  3  |  4

--------------------------

5  |  11| 12 | 13 | 14

6  |  21| 22 | 23 | 24

Where the top row is A (values 1 to 4), the left column (values 5 and 6) is B and the field values (11 to 24) are Y.

Now I want to find the value Y belonging to A=2,5 and B=5,5 using linear interpolation.

Currently I have split the table into multiple small tables, one for each column, and then first create a new table for A=2,5 and then interpolate in that table to find the result for B=5,5.

This however takes a lot if programming to create the table for A=2,5 (as we have to first indicate which two tables to use based on the value of A).

Is there a direct way of doing this?

Thanks in advance for your replies.