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Dynamic array formula (compare cells between rows)|General Excel Questions & Answers|Excel Forum|My Online Training Hub

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sp_CrumbsHome HomeExcel ForumGeneral Excel Questions & Answe…Dynamic array formula (compare cell…
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Dynamic array formula (compare cells between rows)
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austris bahanovskis
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February 23, 2023 - 4:22 am
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Hi all,
It would be great if somebody could help out with writing a dynamic array formula that:

- takes a dynamic array as input

- compares each cell's value to the value right beneath it and returns true/false depending if the value matches or not

For instance, if I've got a dynamic array, i.e. I never know how many rows there will be (column count is fixed though) in A1#:

3 8 6 2
5 2 5 4
6 5 5 7

I'd like to get back also a dynamic array:

FALSE FALSE FALSE FALSE
FALSE FALSE TRUE FALSE

The trick (for me anyway) is the changing number of rows in the source array - I tried the byrow or bycolumn but once I start putting lambdas in there and passing arrays as arguments - all I get is calc error.

Anybody?

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Velouria
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February 24, 2023 - 7:12 pm
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Here's one way to do it:

 

=LET(data,A1#,MAKEARRAY(ROWS(data)-1,COLUMNS(data),LAMBDA(r,c,INDEX(data,r,c)=INDEX(data,r+1,c))))

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Janset Beyaz

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February 25, 2023 - 11:11 am
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Another option

=DROP(A1#,-1)=DROP(A1#,1)

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The following users say thank you to Janset Beyaz for this useful post:

Velouria
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austris bahanovskis
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February 26, 2023 - 3:28 am
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Velouria - this was along the way I was trying to solve it - but failed where you did not - great!
Janset - words fail me - it's unbelievable how simple it was all along!!

Thanks you so much!!!!

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