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POOptimize Excel Formula that uses large arrays
 

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  1. POOptimize Excel Formula that uses large arrays
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    <p>I have used the below mentioned excel formula.</p> <pre><code>=INDEX(TABL,SMALL(IF(COUNTIF(H2,$A$1:$A$325779)*COUNTIF(I2,"&lt;="&amp;$B$1:$B$325779),ROW(TABL)-MIN(ROW(TABL))+1),1),3) </code></pre> <p>Where "TABL",a table, is A1:E325779 and is the source of my lookup array.</p> <p>The formula mentioned is the exact requirement but is taking a lot of time to update the excel for 400,000+ cells containing this formula.</p> <p>Can this be optimized? Or can this be equated to a faster macro?</p> <p>Its taking 1 second to update 1 cell!!! That's a very long time to update all 400K+ cells once!!!</p> <p>Screenshot of a sample worksheet is as below.</p> <p><img src="https://i.stack.imgur.com/1g5Ka.png" alt="enter image description here"></p> <p>I have based my program on Martin Carlsson's. it is processing 100 records in 30 seconds. can it be improved?</p> <pre><code>Sub subFindValue() Application.ScreenUpdating = False Application.DisplayStatusBar = False Application.Calculation = xlCalculationManual Application.EnableEvents = False Cells(2, 12) = Format(DateTime.Now, "yyyy-MM-dd hh:mm:ss") Dim varRow As Variant Dim varRowMain As Variant Dim lookupTable As Variant Dim lookupValueTable As Variant lookupValueTable = Range("G2:J309011").Value lookupTable = Range("A2:D325779").Value varRowMain = 1 varRow = 1 Do Until varRowMain = 309011 Do Until varRow = 325779 If lookupTable(varRow, 1) = lookupValueTable(varRowMain, 1) And lookupTable(varRow, 2) &gt;= lookupValueTable(varRowMain, 2) Then lookupValueTable(varRowMain, 3) = lookupTable(varRow, 3) lookupValueTable(varRowMain, 4) = lookupTable(varRow, 4) Exit Do End If varRow = varRow + 1 Loop If IsEmpty(lookupValueTable(varRowMain, 3)) Then lookupValueTable(varRowMain, 3) = "NA_OX" lookupValueTable(varRowMain, 4) = "NA_OY" End If varRowMain = varRowMain + 1 varRow = 1 Loop Range("G2:J309011").Value = lookupValueTable Cells(3, 12) = Format(DateTime.Now, "yyyy-MM-dd hh:mm:ss") Application.ScreenUpdating = True Application.DisplayStatusBar = True Application.Calculation = xlCalculationAutomatic Application.EnableEvents = True End Sub </code></pre>
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    1. This table or related slice is empty.
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    1. USViktor Tango
    1. USViktor Tango
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POOptimize Excel Formula that uses large arrays
      1. USViktor Tango
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    1. COEvaluate the formula then stick in the result in the cell? Have you thought about that?
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      1. This table or related slice is empty.
    2. COCopy Pasting as value comes after the formulas are evaluated. the problem is the formula computation for each cell will take more than 48 hours in any scenario (each cell takes at least 1 sec to update). So looking out for ideas to get faster data processing. Like in the image pasted above, there is just one test data (Gold,2.5), in actual there are 400,000+ such records to be searched out from 300,000+ records of the lookup table.
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    3. COconsider VBA solution instead of array function, or any built in function. They run different in different threads and I assure you the VBA is much quicker
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      1. This table or related slice is empty.
 

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