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Help Needed: Write an Excel Macro

Discussion in 'Software Development' started by mine75, Oct 10, 2008.

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  1. mine75

    mine75 Thread Starter

    Oct 10, 2008
    Hi, all excel expert! I need help in writing a macro to do a sum in excel (which has 1milion lines of data).
    I am trying to do a cumsum column where it will cum previous roll value in the Value column if the Object_Type matches to it’s previous, IF not it will print the value at Value colume. See the table below at row 8, where the cumsum value is the Value in column B, bc of mismate of A(8) to A(7). Anyone knows how to write this? See example below. Thanks.

    =IF(A2=A1,SUM(B2,C1),B2) รจ formula in excel (I can’t do this with 2million lines of data in excel)

    I know how to do it for hundreds line data, but the dataset that's 1million lines.. :(
    Please help...

    ColA ColB ColC
    ObjectType Value CumSum
    A 1 1
    A 2 3
    A 2 5
    A 1 6
    A 0 6
    A 5 11
    Z 3 3
    Z 2 5
    Z 0 5
    Z 1 6
    Z 4 10
    Q 2 2
    Q 0 2
    Q 0 2
    W 1 1
    W 1 2
    W 3 5
    W 4 9
  2. HCD


    Oct 29, 2007
    Not sure on limitations within macros - but have you tried running "cumulative" macros. Take selection of macros to "cumsum" say 100,000 lines and then run a final macro to take all of the 100,000 calculations. Presumably the numbers are all fixed, whole numbers with no decimal places....?
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