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Array Formula too slow in calculation

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    Array Formula too slow in calculation

    hi,

    Below is the array formula which is taking too much time on calculation process. Is there any other formula which can perform faster.

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    Forum Guru Pete_UK's Avatar
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    Re: Array Formula too slow in calculation

    Don't use full-column references like $D:$D in array formulae, as every cell in that range will be examined (as well as E:E, F:F, and G:G). Make your ranges just as large as required.

    You could also think about using SUMIFS if the value you are looking for in column G is numeric.

    Hope this helps.

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    Re: Array Formula too slow in calculation

    Thanks, I will try with required ranges.

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    Re: Array Formula too slow in calculation

    As Pete says, don't use full column references in Array Formulae, ever.

    Try it this way:

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    Trevor Shuttleworth - Excel Aid

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    Forum Guru TMS's Avatar
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    Re: Array Formula too slow in calculation

    This puts the Formula to Value conversion back in:

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    Forum Guru Pete_UK's Avatar
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    Re: Array Formula too slow in calculation

    Hi Trevor,

    it is not made clear, but it might be that the formulae are placed in a different sheet than Daily_Summary (as they use B2= ... , N2= ...etc.), so LastRow might be different on the two sheets.

    Pete

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    Forum Guru TMS's Avatar
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    Re: Array Formula too slow in calculation

    Good thought Pete.

    Maybe this then:

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    Re: Array Formula too slow in calculation

    Why limit yourself to column A? Since EVERY nonblank cell is in UsedRange, LastRow = .UsedRange.Row + .UsedRange.Rows.Count - 1 would be the bottommost row in use in any column in UsedRange.

    That said, if this is going to be an array formula anyway, make it even more efficient by skipping the multiplication.

    "=IFERROR(INDEX(Daily_Summary!"$G$2:$G$" & LastRow & ",MATCH(TRUE," & _
    "IF(B2=Daily_Summary!$D$2:$D$" & LastRow & "," & _
    "IF(N2=Daily_Summary!$E$2:$E$" & LastRow & "," & _
    "P2=Daily_Summary!$F$2:$F$" & LastRow & ")),0)),0)"

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    Re: Array Formula too slow in calculation

    If you're ultimately converting this to values anyway, if the worksheet containing these results and Daily_Summary both have distinct column labels in row 1, you could use MS Query to create an outer join of the 2 ranges as tables. This sort of operation is a table join, so a database approach to performing it may be the most efficient way.

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    Re: Array Formula too slow in calculation

    @Pete & TMS

    Thanks, both your suggestion and code works perfectly.

  11. #11
    Forum Guru TMS's Avatar
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    Re: Array Formula too slow in calculation

    You're welcome. Thanks for the rep.

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