# Excel Reverse Matrix Lookup

## Are you familiar with INDEX MATCH?

If you’re familiar with Index and Match you know how to solve a matrix lookup problem. You want to find a value inside the matrix by looking up the row and column headers.

What happens though when it’s reversed? You want to find the column header based on the value inside the matrix as well as the row header.

To solve this Excel problem, we will take a look at INDEX & MATCH and use two sets of INDEX MATCH to get our result. We will actually use the row argument of index inside the column argument to help us correct the range for the match function. Sounds confusing? It’s actually quite simple;

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1. Tom Cooper July 29, 2017 at 8:54 pm - Reply

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2. Deniz Aksen August 29, 2017 at 3:02 am - Reply

My solution would be slightly different, Leila.

FIRST:
i-) Select with your mouse the range A4:G6 and then either press the shortcut CTRL+SHIFT+F3 or go to the “Defined Names” group in the “FORMULAS” ribbon in your Excel menu bar.
ii-) Tell Excel that you want to “Create Names From Selection” where names are to be created from values in the “Left column” only.

Presto! You have now AUTOMATICALLY created the name “Product_1” for the row vector range B4:G4, the name “Product_2” for the row vector range B5:G5, and finally the name “Product_3″ for the row vector range B6:G6.

THEN:
Write this formula and enter it as a simple formula –> =INDEX(B3:G3,MATCH(B10,INDIRECT(SUBSTITUTE(B9,” “,”_”)),0))
Vola!

Note:
Had there been no blank spaces inside the product names, we wouldn’t have to use the SUBSTITUTE() function. In that case, we would simply write INDIRECT(B9). However, since blank spaces in a cell value are automatically replaced by the underscore character “_” when a named range is created with that value as its name, we should do the same substitution before calling the name inside an INDIRECT() function.

Cheers’n best regards! — Deniz

• Leila Gharani August 31, 2017 at 2:36 pm - Reply

Nice :) Thank you Deniz for sharing.

3. MAHBUB October 28, 2017 at 9:32 pm - Reply

Thanks a lot Deniz for your solution. But as a ordinary user it seemed to me much critical to understand. Your formula seems much complicated and several additional steps are to be taken to get the result like Defining Name, SUBSTITUTE(), INDIRECT().

The most important is that , Deniz’s formula will not work for the following two situation, where Leila’s formula will be effective:

a. The names are not dynamic! If I need to change the name of the product for example ‘Product 1’ is renamed as ‘Product 1 Small’ then the Defined Name will NOT work.

b. If we delete any of the product (or if the order of the product sequence are changed e.g. Product 2, Product 1) then also Deniz’s formula will NOT work.
But in both the situation Leila’s formula will work fine. It is time saving, easy and most importantly dynamic.

Thanks to both of you for sharing.

Regards

MD MAHBUB HOSSAIN

• Leila Gharani October 30, 2017 at 12:44 pm - Reply

Thank you Mahbub for the detailed analysis.

• MAHBUB October 30, 2017 at 11:05 pm - Reply

My pleasure Leila!

And thank you once again for such nice tutorial !

I wish I could join your Excel courses!!!