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Asked: 2026-06-15T19:47:41+00:00

I am attempting to identify a subset of a range based on TRUE FALSE

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I am attempting to identify a subset of a range based on TRUE FALSE statements. An example is in the following chart below.

FALSE   FALSE   1.21147
TRUE    FALSE   1.20984
FALSE   FALSE   1.21083
FALSE   FALSE   1.210315
FALSE   TRUE    1.21151
FALSE   FALSE   1.21335
FALSE   FALSE   1.213515
FALSE   FALSE   1.212435
TRUE    FALSE   1.212125
FALSE   FALSE   1.21226

In this scenario I want a subset to be identified based on alternating TRUE statements. In the left side column the first TRUE statement would trigger the beginning of the subset an the TRUE statement in the second column would trigger the end of the subset. I then want to use a simple max function to identify the MAX in the third column. I would use an IF statement to determine whether or not the first TRUE statement is correct however, i am unable to figure out how to identify the subset of the range based on the TRUE statement in the second column. I also want to know whether or not this works from going from the top to the bottom if the statement could possible work going the bottom to the top. Any help would be most appreciated.

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1 Answer

  1. Editorial Team

    Part 1 can be done using a combination of MATCH, OFFSET and MAX

    For this example I’ve assumed your data is located starting at cell A2.

    For the sake of clarity I use some intermediate results in cells E1:E4. If you prefer a single formula, simply merge the intermediate formula into the final formula

    Cell E2 = position of first TRUE in column A

    =MATCH(TRUE,A2:A11,0)

    Cell E3 = position of first TRUE in column B

    =MATCH(TRUE,B2:B11,0)

    Result formula, Max value in column C between the rows found in E2 and E3 (inclusive)

    =MAX(OFFSET($C$1,E2,0,E3-E2+1,1))

    Part 2 is more tricky: I don’t think you can search up a range for a value. However, looking at your data it may be OK to search down for the second TRUE? If this is OK then:

    Cell E4 = position of second TRUE in column A

    =MATCH(TRUE,OFFSET(A2:A11,E2,0),0)

    Or this, entered as an array formula (Insipred by Barry) which will get the last TRUE in the column

    =MATCH(2, 1/(A2:A11=TRUE),1)

    Result formula, Max value in column C between the rows found in E3 and E4 (inclusive)

    =MAX(OFFSET($C$1,E3,0,E4+E2-E3+1,1))
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