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reverse dynamic series

  1. #1
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    01-18-2005
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    reverse dynamic series

    I am using the following formula to perform operations on two data series

    The formula is in cell E7 all values are numeric.

    =100*SUMPRODUCT(D7:D8,(A8-A7:A8))

    Here is the product sum that I need (notice it is NOT the same as produced from the function above.

    100 *( (D8 * A8-A7) + (D7 * A8-A8) )

    I tried the following and looked in help to no avail

    =100*SUMPRODUCT(D8:D7,(A8-A7:A8))

    The above formula simply reverts to the one up top.

    how do I reverse the order of the "D" series in this funtion?

  2. #2
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    Join Date
    01-18-2005
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    4
    I believe that this works:

    old formula
    =100*SUMPRODUCT(D7:D8,(A8-A7:A8))


    new formula

    =100*SUMPRODUCT(D7:D8,(A8:A8-A7))

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