How do I code a 2-D look-up table in a DIadem script?

Question

Based on two existing Diadem variables, what is the syntax for doing a
linear interpolation inside a 6 x 5 table to calculate a third value
that is a function of both of the first two variables?  This would
be similar to doing a horizontal and a vertical lookup in Excel.

Answer 1

Hi Brad,
Sorry I wasn't more specific.  I've copied the entire table
below; I can reference in any manner that would make sense; its entries
are constants.  First I'd like to check the value of a Diadem
variable, 'efficiency', to see if it's between 0.2 and 0.7 (the first
row of the table).  If it is outside that range, then the new
variable 'bypass' should be set to zero.  Then I'd like to check
the Diadem variable "utility" to be within 5 and 50 inclusive (the
first column of the table).  If it is outside the range, then
again bypass should equal zero.  If efficiency and utility are
both within range, then I'd like to linearly interpolate between the
values of the table (based on efficiency and utility) to calculate
bypass.
0.2
0.3
0.4
0.5
0.6
0.7
5
1.5
2
3
3.5
4.5
6
8
1.8
2.9
4.2
5
10.9
15.3
10
2
3.5
5
7
14
21.5
30
4
8
17
31
40
80
50
5.5
16
17
31
40
80
Thank you for your help - aviatrix.