How to apply a formula to cells in a given range? - google-sheets

I have a sheet that is the result of a query and can return an arbitrary number of result rows (the number of columns is fixed).
I am calculating the range that corresponds to the result set. This is working well. I use it to copy the result set into my sheet.
Now that I have the results copied to my sheet I want to add a column with a formula that works against the cells in the row. How to do this? The issue is that the number of rows is not fixed, how to have the formula apply to the rows that happen to be there.
Here is a sample sheet:
Result Set is the output of the query
Report is the sheet I made with a copy of the result set
Link to Sheet
Column C is what I am trying to populate, the number of rows for Columns A and B will update each time I open the sheet.


Another way:
=arrayformula(if(A13:A<>"",A13:A&"="&B13:B,""))

Related

How do I make a google sheets AND formula repeat in each row automaticaly

I have a large spreadsheet that is the result of a query on another sheet. I'm trying to make a recurring (array?) formula that will repeat in every row.
The original formula is
=AND(Index(N2:N,1,1)="FALSE", Index(H2:H,1,1)="Regular", Index(O2:O,1,1)<44801)
This returns a True value if all 3 conditions are met. but only works on that row, so I need to copy it into each row (dragging the + marker on the cell down).
When data is added to the other sheet, the query returns more rows, I'd like not to have to do the copying of the formula to the new rows added
I tried to do this on the top row
=Arrayformula({"name of this column"; AND(Index(N2:N,1,1)="FALSE", Index(H2:H,1,1)="Regular", Index(O2:O,1,1)<44801)})
But I'm only getting a result in the row 2 and nothing in the following rows.
What am I doing wrong?

Try
=arrayformula((N2:N=FALSE)*(H2:H="Regular")*(O2:O<44801))
or
=arrayformula(if((N2:N=FALSE)*(H2:H="Regular")*(O2:O<44801),TRUE))

How can I use arrayformula so I got the cell value that used last time?

I have a table of content on google sheet where word list on column B and image name on column C. On column C image name is not given for every cell. Now I need to use ARRAYFORMULA on Cell D1 where it will give the output (Word name and Image Name) on Column D if Row of Column A is not empty. If you look at the attached screenshot, for some Word there is no image name given on column C. In this case I need the image name that used last time.
For example: On Row 17 for WORD 4 there is no image name given. So, in this case the image name will be Image 2 from cell C12 that used previously for WORD 3. I tried it in many different ways but never able to do it with ARRAYFORMULA. The only solution I am using right now is using formula for every row which is not a good solution. I need to do it with ARRAYFORMULA. I don't want to do it with google script.
➡ Spreadsheet link (Please check Tab 1)
➡ Please check the Screenshot

I have added a sheet ("Erik Help") with the following formula in D1:
=ArrayFormula({"Header";IF(A2:A="",,B2:B&" : "&VLOOKUP(ROW(A2:A),FILTER({ROW(A2:A),C2:C},C2:C<>""),2,TRUE))})
This one array formula creates a header and then fills the entire column with results.
You can change "Header" to whatever you like.
IF(A2:A="",, just leaves D2:D null if nothing is in that row of Col A.
Otherwise, whatever is in B2:B is concatenated with a space-colon-space and then a VLOOKUP of all rows within a FILTERed virtual array that contains only rows and Col-C data where Col C is not blank. Because TRUE is chosen as the final parameter, all rows will "look backward" to the last row where Col C did contain data and return that data as the final piece to be concatenated.

=if(isnumber(SEARCH("WORD",B2,1)),join(" : ",B2, indirect(ARRAYFORMULA(address(IFNA(match(2,1/($C$2:$C2<>"")))+1,COLUMN(C2))))),"")
past this formula in D1 cell and drag it ...

Apply same formula to every cell

I have a sheet with several numbers, which I want to convert to percentage. These are scores imported from a form, where the maximum score is 5.
According to the bellow image, the cell B2, I applied a basic formula =(3/5)*100% to convert three to 60%.
In order to avoid copy and paste the same formula into all cells, is there any formula to find all the cells and apply its value, divide per 5 and multiple per 100%? I thought something similar to Javascript such as (this/5)*100%.
https://docs.google.com/spreadsheets/d/1ZtqJaXy1pHkjk1sywGfSodo0FcOoLlkou79cZBk-jmU/edit?usp=sharing

you could treat it as array and on Sheet2 use:
=ARRAYFORMULA(IF(Sheet1!B2:AA="";;(Sheet1!B2:AA/5)*100%))
demo sheet

I've also looked for a solution to this for some time.
I don't think it's possible as a cell can only hold one value and the moment you try to change that value, it will delete the value.
Your best bet is to create a different table on the same sheet that references the specified values, then copy and paste the results (values only).

Just create a second Sheet, then in cell B2 of Sheet2 use the formula =Sheet1!B2/5*100%.
Then copy the formula to all cells of Sheet2.

How to count rows between 2 non empty cells with their intermediary empty cells in Google Sheets?

I'm trying to count each rows of empty cells between two non-empy cells and adding the upper non empty-cell count (or the lower non-empty cells count) to the result when the empty cells/rows numbers are variable and irregular in this manner:
A1 Empty
A2 Non-empty
A3 Empty
A4 Empty
A5 Empty
A6 Empty
A7 Non-empty
(with A2 to A5 being irregular — could be any number of intermediary empty rows/cells — i.e. 10, 2, 30, 5, etc., and variable — could be located in any location within Column A)
The result should return as follow:
=IFS(
AND(A2="",A3=""),"",
AND(A2="",A3<>""),"",
AND(A2<>"",A3<>""),ROWS(A2),
AND(A2<>"",A3=""),ROWS(A2:UP TO NEXT NON-EMPTY ROW BENEATH (NOT COMPRISED (or minus the next non-empty row(-1)))
How do we program Google Sheets to count rows "UP TO NEXT NON-EMPTY ROW BENEATH (NOT COMPRISED (or minus the next ono empty row(-1)) when the emppty intermediary rows' count is variable/unknown for each occurence and irregular/can be any number of intremediary rows?
I have this data as example:
So far, I've come up with this partial solution:
=IFS(AND(A2="",A3=""),"", AND(A2="",A3<>""),"", AND(A2<>"",A3<>""),ROWS(A2), AND(A2<>"",A3=""),ROWS(A2:UP TO NEXT NON-EMPTY ROW BENEATH (NOT COMPRISED (or minus the next non-empty row(-1)))))
The expected result should return as follows:
The Sheet copy:
https://docs.google.com/spreadsheets/d/1eLXdFINKVtS5Fxon8mIQDmBUTZokyY_Fb6tfWJRDOVI/edit?usp=sharing

Well I think you can do it a bit more elegantly using a reverse lookup. The idea is to sort the data on descending order of row number, then use a match with -1 as the last parameter, which is equivalent to searching from the end of the data for the next non-blank.
=ArrayFormula(iferror(if(A2:A="","",rows(A2:A)+2-match(row(A2:A)+1,
query(SORT({IF(A2:A<>"",row(A2:A),""),row(A2:A)},2,false),"select Col1"),-1)-row(A2:A)),1))
If you wanted to keep it simple and just use a pull-down formula, an ordinary match is enough:
=ArrayFormula(iferror(if(A2="","",match(true,A3:A<>"",0)),1))
(it still has to be entered as an array formula because A3:A<>"" is an array of True and False)

I found a solution with a Monster formula but with simple iterative logics, and up to 50 intermediary blanks (for more only need to make the formula larger).
What I was lookind for was simply to print the cells/rows count of intermediary empty cells between 2 non-empty cells + adding to the count either the 1st non-empty cell or the last non-empty cell.
So for example if cell A1 and cell A9 have 8 empty cells between them, then return 8+1 (or 10-1).
The logics used is simple:
probe how many possible empty cells there can be between each 2 non-empty cells counting the 1st non-empty as well within column A (in the formula below the possibility is up to 50 empty cells), and for each case return the intermediary rows -1 (the last row).
The formula:
=IFS(AND(A1="",A2=""),"",AND(A1="",A2<>""),"",AND(A1<>"",A2<>""),ROWS(A1),AND(A1<>"",A2="",A3<>""),ROWS(A1:A3)-1,AND(A1<>"",A2="",A3="",A4<>""),ROWS(A1:A4)-1,AND(A1<>"",A2="",A3="",A4="",A5<>""),ROWS(A1:A5)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6<>""),ROWS(A1:A6)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7<>""),ROWS(A1:A7)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8<>""),ROWS(A1:A8)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9<>""),ROWS(A1:A9)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10<>""),ROWS(A1:A10)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11<>""),ROWS(A1:A11)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12<>""),ROWS(A1:A12)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13<>""),ROWS(A1:A13)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14<>""),ROWS(A1:A14)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15<>""),ROWS(A1:A15)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16<>""),ROWS(A1:A16)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17<>""),ROWS(A1:A17)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18<>""),ROWS(A1:A18)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19<>""),ROWS(A1:A19)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20<>""),ROWS(A1:A20)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21<>""),ROWS(A1:A21)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22<>""),ROWS(A1:A22)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23<>""),ROWS(A1:A23)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24<>""),ROWS(A1:A24)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25<>""),ROWS(A1:A25)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26<>""),ROWS(A1:A26)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27<>""),ROWS(A1:A27)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28<>""),ROWS(A1:A28)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29<>""),ROWS(A1:A29)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30<>""),ROWS(A1:A30)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31<>""),ROWS(A1:A31)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32<>""),ROWS(A1:A32)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33<>""),ROWS(A1:A33)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34<>""),ROWS(A1:A34)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35<>""),ROWS(A1:A35)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36<>""),ROWS(A1:A36)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37<>""),ROWS(A1:A37)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38<>""),ROWS(A1:A38)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39<>""),ROWS(A1:A39)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40<>""),ROWS(A1:A40)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41<>""),ROWS(A1:A41)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42<>""),ROWS(A1:A42)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42="",A43<>""),ROWS(A1:A43)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42="",A43="",A44<>""),ROWS(A1:A44)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42="",A43="",A44="",A45<>""),ROWS(A1:A45)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42="",A43="",A44="",A45="",A46<>""),ROWS(A1:A46)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42="",A43="",A44="",A45="",A46="",A47<>""),ROWS(A1:A47)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42="",A43="",A44="",A45="",A46="",A47="",A48<>""),ROWS(A1:A48)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42="",A43="",A44="",A45="",A46="",A47="",A48="",A49<>""),ROWS(A1:A49)-1,AND(A1<>"",A2="",A3="",A4="",A5="",A6="",A7="",A8="",A9="",A10="",A11="",A12="",A13="",A14="",A15="",A16="",A17="",A18="",A19="",A20="",A21="",A22="",A23="",A24="",A25="",A26="",A27="",A28="",A29="",A30="",A31="",A32="",A33="",A34="",A35="",A36="",A37="",A38="",A39="",A40="",A41="",A42="",A43="",A44="",A45="",A46="",A47="",A48="",A49="",A50<>""),ROWS(A1:A50)-1)
Here the images sheet of the result:
The Sheet
Can it be done in a simpler way but still with a single formula?
Thanks a lot for your next input!

In the mean time I did some simplification of my previous Monster formula and learned the ArrayFormula application in the process.
1st I tried to shorten the big blank cells intervals into ranges formulations to see if it still worked.
For example I changed:
AND(A1<>"",A2="",A3="",A4<>""),ROWS(A1:A4)-1,
into
AND(A1<>"",A2:A3="",A4<>""),ROWS(A1:A4)-1,
And it shortened my formula from this:
to this:
But then when pasting the new formula I got a #VALUE! error 'an array value could not be found'.
After further tests, I used the ArrayFormula and it worked by adapting the simple 'ranges' previously used to Arrays:
from this
AND(A1<>"",A2:A3="",A4<>""),ROWS(A1:A4)-1,
into this
AND(A1<>"",ArrayFormula(A2:A3=""),A4<>""),ROWS(A1:A4)-1,
With this final result:
=IFS(AND(A1="",A2=""),"",AND(A1="",A2<>""),"",AND(A1<>"",A2<>""),ROWS(A1),AND(A1<>"",A2="",A3<>""),ROWS(A1:A3)-1,AND(A1<>"",ArrayFormula(A2:A3=""),A4<>""),ROWS(A1:A4)-1,AND(A1<>"",ArrayFormula(A2:A4=""),A5<>""),ROWS(A1:A5)-1,AND(A1<>"",ArrayFormula(A2:A5=""),A6<>""),ROWS(A1:A6)-1,AND(A1<>"",ArrayFormula(A2:A6=""),A7<>""),ROWS(A1:A7)-1,AND(A1<>"",ArrayFormula(A2:A7=""),A8<>""),ROWS(A1:A8)-1,AND(A1<>"",ArrayFormula(A2:A8=""),A9<>""),ROWS(A1:A9)-1,AND(A1<>"",ArrayFormula(A2:A9=""),A10<>""),ROWS(A1:A10)-1,AND(A1<>"",ArrayFormula(A2:A10=""),A11<>""),ROWS(A1:A11)-1,AND(A1<>"",ArrayFormula(A2:A11=""),A12<>""),ROWS(A1:A12)-1,AND(A1<>"",ArrayFormula(A2:A12=""),A13<>""),ROWS(A1:A13)-1,AND(A1<>"",ArrayFormula(A2:A13=""),A14<>""),ROWS(A1:A14)-1,AND(A1<>"",ArrayFormula(A2:A14=""),A15<>""),ROWS(A1:A15)-1,AND(A1<>"",ArrayFormula(A2:A15=""),A16<>""),ROWS(A1:A16)-1,AND(A1<>"",ArrayFormula(A2:A16=""),A17<>""),ROWS(A1:A17)-1,AND(A1<>"",ArrayFormula(A2:A17=""),A18<>""),ROWS(A1:A18)-1,AND(A1<>"",ArrayFormula(A2:A18=""),A19<>""),ROWS(A1:A19)-1,AND(A1<>"",ArrayFormula(A2:A19=""),A20<>""),ROWS(A1:A20)-1,AND(A1<>"",ArrayFormula(A2:A20=""),A21<>""),ROWS(A1:A21)-1,AND(A1<>"",ArrayFormula(A2:A21=""),A22<>""),ROWS(A1:A22)-1,AND(A1<>"",ArrayFormula(A2:A22=""),A23<>""),ROWS(A1:A23)-1,AND(A1<>"",ArrayFormula(A2:A23=""),A24<>""),ROWS(A1:A24)-1,AND(A1<>"",ArrayFormula(A2:A24=""),A25<>""),ROWS(A1:A25)-1,AND(A1<>"",ArrayFormula(A2:A25=""),A26<>""),ROWS(A1:A26)-1,AND(A1<>"",ArrayFormula(A2:A26=""),A27<>""),ROWS(A1:A27)-1,AND(A1<>"",ArrayFormula(A2:A27=""),A28<>""),ROWS(A1:A28)-1,AND(A1<>"",ArrayFormula(A2:A28=""),A29<>""),ROWS(A1:A29)-1,AND(A1<>"",ArrayFormula(A2:A29=""),A30<>""),ROWS(A1:A30)-1,AND(A1<>"",ArrayFormula(A2:A30=""),A31<>""),ROWS(A1:A31)-1,AND(A1<>"",ArrayFormula(A2:A31=""),A32<>""),ROWS(A1:A32)-1,AND(A1<>"",ArrayFormula(A2:A32=""),A33<>""),ROWS(A1:A33)-1,AND(A1<>"",ArrayFormula(A2:A33=""),A34<>""),ROWS(A1:A34)-1,AND(A1<>"",ArrayFormula(A2:A34=""),A35<>""),ROWS(A1:A35)-1,AND(A1<>"",ArrayFormula(A2:A35=""),A36<>""),ROWS(A1:A36)-1,AND(A1<>"",ArrayFormula(A2:A36=""),A37<>""),ROWS(A1:A37)-1,AND(A1<>"",ArrayFormula(A2:A37=""),A38<>""),ROWS(A1:A38)-1,AND(A1<>"",ArrayFormula(A2:A38=""),A39<>""),ROWS(A1:A39)-1,AND(A1<>"",ArrayFormula(A2:A39=""),A40<>""),ROWS(A1:A40)-1,AND(A1<>"",ArrayFormula(A2:A40=""),A41<>""),ROWS(A1:A41)-1,AND(A1<>"",ArrayFormula(A2:A41=""),A42<>""),ROWS(A1:A42)-1,AND(A1<>"",ArrayFormula(A2:A42=""),A43<>""),ROWS(A1:A43)-1,AND(A1<>"",ArrayFormula(A2:A43=""),A44<>""),ROWS(A1:A44)-1,AND(A1<>"",ArrayFormula(A2:A44=""),A45<>""),ROWS(A1:A45)-1,AND(A1<>"",ArrayFormula(A2:A45=""),A46<>""),ROWS(A1:A46)-1,AND(A1<>"",ArrayFormula(A2:A46=""),A47<>""),ROWS(A1:A47)-1,AND(A1<>"",ArrayFormula(A2:A47=""),A48<>""),ROWS(A1:A48)-1, AND(A1<>"",ArrayFormula(A2:A48=""),A49<>""),ROWS(A1:A49)-1, AND(A1<>"",ArrayFormula(A2:A49=""),A50<>""),ROWS(A1:A50)-1)
New Sheet here

How to use index match formula that automatically expands in Google Sheets

In Google Sheets I am using a filter function to pull in Names into column A and a Timestamp into column B. Every time a second occurrence of the name shows up into columns A & B of the list I want column C next to the prior occurrence to reference the new timestamp. In column D I will then calculate the difference from the names timestamp and the next occurrence of that same name.
Currently I am using the following formula:
=IFERROR(INDEX(B3:B,MATCH(A2,A3:A,0)))
If I drag this formula down it does what I need it to do, but due to how many rows are being added to the first two columns, rows are being added to the bottom of the sheet due to the filter and the formulas keep needing to be dragged down. The durations in column D are being calculated with the following formula, that automatically arrays the results and automatically expands with the filter results:
=IFERROR(ARRAYFORMULA(IF(C2:C="","",C2:C-B2:B)))
I would like my index match formula to do the same, but it seems I cannot use the index formula with an arrayformula.
I attempted to achieve this by using a vlookup combined with an offset for the range. The first row is giving me the result I want, but all the subsequent rows are not referencing the offset range, probably because the offset isn't changing with each new array result here is that attempt:
=IFERROR(ARRAYFORMULA(VLOOKUP(A2:A,OFFSET(A2:B,1,0),2,FALSE)))
Any ideas how this could be accomplished by placing a formula in one cell, or would this have to be accomplished with a script?
I have added an example spreadsheet of the current method HERE
Thanks in advance for any help.

Formula
Instead of
INDEX, MATCH and OFFSET
try the following formula
=ArrayFormula(IFERROR(VLOOKUP(
TRANSPOSE(VALUE(REGEXEXTRACT(QUERY(TRANSPOSE(
IF(FILTER(ROW(A2:A),LEN(A2:A))<TRANSPOSE(FILTER(ROW(A2:A),LEN(A2:A))),
IF(FILTER(A2:A,LEN(A2:A))=TRANSPOSE(FILTER(A2:A,LEN(A2:A))),
TRANSPOSE(FILTER(ROW(A2:A),LEN(A2:A))),
),)
),,2000000),"(\d+)"))),
FILTER({ROW(A2:A),B2:B},LEN(A2:A)),2,0)))
Formula description
This part creates a square matrix showing the row number of the value that matches if it's below of the current row:
IF(FILTER(ROW(A2:A),LEN(A2:A))<TRANSPOSE(FILTER(ROW(A2:A),LEN(A2:A))),
IF(FILTER(A2:A,LEN(A2:A))=TRANSPOSE(FILTER(A2:A,LEN(A2:A))),
TRANSPOSE(FILTER(ROW(A2:A),LEN(A2:A))),
),)
This part takes the smallest row that matches the current row (the next occurrence of the row value)
TRANSPOSE(VALUE(REGEXEXTRACT(QUERY(TRANSPOSE( ),,2000000),"(\d+)")))
This part returns the related value, if any, otherwise a blank:
IFERROR(VLOOKUP( ,FILTER({ROW(A2:A),B2:B},LEN(A2:A)),2,0)))

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