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Autofill referencing every nth cell

  1. #1
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    Autofill referencing every nth cell

    Hi,

    I am having trouble using autofill to reference every nth cell.

    For example, for N=2, I want
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    For N=5, I want
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    The values are then summed and multiplied by a constant and then N.
    For N=2, SUM(column)*0.035/3*2
    For N=5, SUM(column)*0.035/3*5

    Attached is the .xlsx of a small representative data of what I am trying to achieve.

    N.B.: I have asked a similar question and was answered by user Glenn Kennedy prior in a thread called "Autofill referencing non-adjacent cells" (unable to post URL link). He used an array formula which may be applicable to this case. I have been unsuccessful in modifying the formula for this new scenario although it may speed up in reaching a solution to my problem. Once again, appreciate any help given!
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    Re: Autofill referencing every nth cell

    Try this formula in C3
    drag to right an down
    Formula: copy to clipboard
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    Re: Autofill referencing every nth cell

    Please try at I2
    =IF(MOD(ROWS(I$3:I3)-1,I$2),"",$B2+INDEX($B3:$B24,I$2)+($B2+INDEX($B3:$B24,I$2))^0.5)
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    Re: Autofill referencing every nth cell

    Quote Originally Posted by salim ali View Post
    Try this formula in C3
    drag to right an down
    Formula: copy to clipboard
    Please Login or Register  to view this content.
    Hi Salim,

    Thank you for the help. Dragging does produce the correct values.
    It is possible to now use the SUM function to add those values up?
    For example, for N=5, adding every 5th value in column G. I have highlighted this in orange.
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    Re: Autofill referencing every nth cell

    Quote Originally Posted by Bo_Ry View Post
    Please try at I2
    =IF(MOD(ROWS(I$3:I3)-1,I$2),"",$B2+INDEX($B3:$B24,I$2)+($B2+INDEX($B3:$B24,I$2))^0.5)
    Hi Bo_Ry, appreciate your input. I am afraid I do not understand how your formula works but it does produce the correct values!
    May I please ask how I can modify your formula for N=3 or N=10 for example?

    Thank you.

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    Re: Autofill referencing every nth cell

    Change Value at I2:K2

  7. #7
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    Re: Autofill referencing every nth cell

    Hi everyone,

    Just wanted to say I was able to solve my issue. I used the function SUMPRODUCT to add up the values every nth row for those who might be wondering.

    Thank you to all who replied, much appreciated for the help.

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