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Array Formula Issue - Need Help

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    Array Formula Issue - Need Help

    Can somebody tell me why this array formula is doing this?

    I have a table with Prices in one column and Dates in another:

    =SUM($G$2:$G$511*(MONTH($H$2:$H$511)=11))

    That formula sums November perfectly, but when I do this for December:

    =SUM($G$2:$G$511*(MONTH($H$2:$H$511)=12))

    For some reason, it's summing every price in column G and not just the ones for December.

    I have no idea why this is happening. All I did was change the month portion of the formula for each month and every other month is working except for December.

    Any idea?

  2. #2
    Forum Guru Jonmo1's Avatar
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    Re: Array Formula Issue - Need Help

    Hard to say without seeing the data.
    Can you attach a sample workbook?

    Did you enter the formula as an array ?

    ...confirmed by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer.

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    Forum Guru Tony Valko's Avatar
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    Re: Array Formula Issue - Need Help

    Do you get a different result with this formula:

    =SUMPRODUCT(--(MONTH(H2:H511)=11),G2:G511)
    Biff
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    Re: Array Formula Issue - Need Help

    Quote Originally Posted by Tony Valko View Post
    Do you get a different result with this formula:

    =SUMPRODUCT(--(MONTH(H2:H511)=11),G2:G511)
    Amazingly enough....this gives me the same scenario..works for Months January-November, but not December. I do have my formula as an array.

    All my sheet contains are prices in one column and dates in another column. Like maybe 5-10 dates for each month.

  5. #5
    Forum Guru Tony Valko's Avatar
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    Re: Array Formula Issue - Need Help

    OK, we'll need to see the file or a SMALL sample file that reproduces the problem.

    It does sound rather odd!

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