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Incorrect calculation of Vlookup value when running Macro

  1. #1
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    Incorrect calculation of Vlookup value when running Macro

    Hi

    I am running a macro that, among many thing, has to vlookup values for a massive table (about 60,000 cells to calculate).

    After running the macro, I saw that some values had calculated to #N/A even though there were definitely values for their indexes to display. Afterwards I double and triple checked that these values should not have displayed as #N/A.

    I then went through the code line by line and this time all the values calculated 100% correct.

    My question:
    Is it possible that the macro is continuing with the next line of code while all the cells have not completed calculating their Vlookup values and hence certain cells then display #N/A?

    If this is the case, is there a way that I can put a 'pause' after the vlookup to give Excel enough time to calculate all the cells?
    Last edited by Kreef; 06-25-2011 at 08:24 AM.

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    Re: Incorrect calculation of Vlookup value when running Macro

    Hi and welcome to the board.
    I suggest you post your macro so that the VBA guys can have a look at it

  3. #3
    Forum Expert royUK's Avatar
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    Re: Incorrect calculation of Vlookup value when running Macro

    Why are using VLOOKUP in the code?
    Hope that helps.

    RoyUK
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    Re: Incorrect calculation of Vlookup value when running Macro

    Thanks for the welcome.
    Even though the code is VERY simple and VERY untidy, I don't think the problem is with the code. But here it is anyways.

    First it puts the formulas in an empty row. This row then obviously calculates all the values to #N/A

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    I then copy the formulas that have been entered into row 35,001 and paste it in the area where I need the values. This area consists of several rows that have been filtered using Autofilter. I thus only paste it into the visible rows.

    It then calculates for quite some time. After this I delete the formulas from row 35,001

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    I make all rows visible again. Select all cells and Special paste them as values to remove the formulas.

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    At the end of all of this, the area contains the following:
    • Rows were columns L to AB are empty (this is correct)
    • Rows were columns L to AB contain the values that were on sheet Prev_Orderwell (this is correct)
    • Rows were columns L to AB contain #N/A where the index in column C did NOT have any corresponding data in Prev_Orderwell (this is correct)
    • Rows were columns L to AB contain #N/A where the index in column C DID have corresponding data in Prev_Orderwell (MY PROBLEM)

    When I paste the formulas from row 35,001 into the area, the values that are brought with the formulas is #N/A. It seems that not all the rows are getting time to recalculate before I copy the entire area and pastes it as values.

    Any thoughts?

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    Re: Incorrect calculation of Vlookup value when running Macro

    Quote Originally Posted by royUK View Post
    Why are using VLOOKUP in the code?
    Because I am still a beginner and I do not know how else to do it. It is working for the purpose that I need it, but it is not working on all the rows...

  6. #6
    Forum Expert royUK's Avatar
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    Re: Incorrect calculation of Vlookup value when running Macro

    I think you would find the .Find Method for VBA much better, see the VBA Help Files.

    It would help if you attached an example workbook

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