Return Sum Of Array Within Matrix Based On Independent Value?

Mar 8, 2013

I'm trying to write a formula that will return the sum of multiple cells within a larger matrix, based on a number that is manually inputted into a separate table. As you can see in the top below, I have data that is grouped by both "Zone" and by individual "Stations". The Zones/Stations on the y-axis are "Start" points, while the Zones/Stations on the x-axis are "Finish" points. What I'd like to be able to do is input a Zone ID number into the bottom table (Shown as "1" below) and have the formula either return the greatest sum of "Finish" numbers. In this example, the greatest sum is 12, which is all numbers going from Station 1 and 2 in Zone 1 to Stations 1/2 in Zone 2 (3+2+4+3). In the bottom table, you'll see the "Greatest Finish" as "2", which is Zone 2. And the total from this sum is 12, as described previously. If there is a way to return either the "Total #" or "Greatest Finish" zone.

The actual matrix I am working with is much larger (150x150), and not all zones have the same amount of stations. I'm assuming this might complicate things a bit.

Finish
Zone 1
Zone 1
Zone 2

[Code]...

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