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MS Office Forum / Excel / Programming / September 2007Array Pointer
Is there an array pointer available in VBA? I use it in other languages to easily and quickly sort and search arrays. My problem is I have two very large spreadsheets and want to get data from one to the other based on a link and the arraypointer would make this easier in my opinion. A simple vlookup formula in the spreadsheet is very slow for a large qty of numbers so I don't really want to use it. Any ideas? Mike, VBA does not use pointers. A better explanation of what you are doing may lead to some suggestions on ways to improve speed.... HTH, Bernie MS Excel MVP > Is there an array pointer available in VBA? I use it in other languages to > easily and quickly sort and search arrays. My problem is I have two very > large spreadsheets and want to get data from one to the other based on a link > and the arraypointer would make this easier in my opinion. A simple vlookup > formula in the spreadsheet is very slow for a large qty of numbers so I don't > really want to use it. Any ideas? Here is what I do. I read into Dataarray() all my entries in a spreadsheet (about 5000). The array is like this: Dataarray(REC#,1)=Account # DataArray(Rec#,2)=Account description if there is one (if it is a valid account). To fill in the second element I do this: Windows("Chart of Accounts.xls").Activate Sheets("Entire Chart").Select Let Counterx = 0 For YY = 1 To X Let XX = 0 Set myRange = Range("A1:A65000") flag = 0 For Each c In myRange Let XX = XX + 1 If c.Value = DataArray(YY, 1) Then flag = 1 If flag = 1 Then Exit For End If Next If flag = 1 Then DataArray(YY, 2) = Cells(XX, 2) Else Let Counterx = Counterx + 1 BadAccts(Counterx, 1) = DataArray(YY, 1) 'MsgBox ("Account " & DataArray(YY, 1) & " is not in the chart of accounts!") End If Next This code takes about 45 minutes to go through 5000 records. Any suggestions would be welcomed. Mike, Not sure where your Account#/Account desc table is, but assuming that it is in columns A and B For i = LBound(DataArray) To UBound(DataArray) DataArray(i, 2) = Application.WorksheetFunction.VLookup(DataArray(i, 1), Range("A:B"), 2, False) Next i But why are you putting this into an array? You could just use the VLOOKUP whenever you want the value. HTH, Bernie MS Excel MVP > Here is what I do. I read into Dataarray() all my entries in a spreadsheet > (about 5000). The array is like this: Dataarray(REC#,1)=Account # [quoted text clipped - 27 lines] > This code takes about 45 minutes to go through 5000 records. Any > suggestions would be welcomed. I don't have to put it into an array. I just want the description for the account in my journal entry file so that I can verify it is a valid account before I upload it. I will see how this goes. Thanks. Bernie, This works tremendously! Instead of 45 minutes, it takes less than 45 seconds. Just one question, the LBound and UBound, does that stand for lower and upper boundary or something like that? > Mike, > [quoted text clipped - 42 lines] > > This code takes about 45 minutes to go through 5000 records. Any > > suggestions would be welcomed. Mike, LBound and UBound are used to read the lower and upper bounds of arrays whose size you don't know. If you had coded Dim DataArray(1 to 5000) As Double then it would be okay to use For i = 1 To 5000 But a lot of operations return arrays of unknown size, so using LBound and UBound to read the size makes sense. There is one other complication - Option Base, which can be used to set the Lower bound of arrays automatically... HTH, Bernie MS Excel MVP > Bernie, This works tremendously! Instead of 45 minutes, it takes less than > 45 seconds. Just one question, the LBound and UBound, does that stand for [quoted text clipped - 46 lines] >> > This code takes about 45 minutes to go through 5000 records. Any >> > suggestions would be welcomed. Why would the lower bound not always be one? Would not an array be populated from 1 to x? > Mike, > [quoted text clipped - 66 lines] > >> > This code takes about 45 minutes to go through 5000 records. Any > >> > suggestions would be welcomed. try this: Sub test() Dim arr As Variant arr = Array("A", "B", "C") MsgBox arr(0) End Sub  SignatureGary > Why would the lower bound not always be one? Would not an array be > populated from 1 to x? [quoted text clipped - 76 lines] >> >> > This code takes about 45 minutes to go through 5000 records. Any >> >> > suggestions would be welcomed. On the msgbox() line, I get runtime error 9, subscript out of range. > try this: > Sub test() [quoted text clipped - 83 lines] > >> >> > This code takes about 45 minutes to go through 5000 records. Any > >> >> > suggestions would be welcomed. even if you try it in a new workbook? do you have option base 1 at the top of your module? try this and see if you get the same result: Option Base 0 Sub test() Dim arr As Variant arr = Array("A", "B", "C") MsgBox arr(0) End Sub SignatureGary > On the msgbox() line, I get runtime error 9, subscript out of range. > [quoted text clipped - 92 lines] >> >> >> > This code takes about 45 minutes to go through 5000 records. Any >> >> >> > suggestions would be welcomed. In an empty sheet, I get "A". In an empty sheet, I get "A". > Would not an array be populated from 1 to x? No. Many arrays are 0 based by default, which is from indexing in binary (0 to 7 can be done using the same number of bits, 1 to 8 requires one more bit than that): Sub CompareArrays() Dim FileArray As Variant Dim myArray As Variant myArray = Array(4, 5, 6) FileArray = Application.GetOpenFilename(MultiSelect:=True) If IsArray(FileArray) Then MsgBox "The lower bound of the file array is " & LBound(FileArray) End If MsgBox "The lower bound of the constant array is " & LBound(myArray) End Sub But then try the same macro with this at the top of your codemodule Option Base 1 and then again with Option Base 0 And, IF you use Dim myArray(1 to 3) As Variant Then you have to use this myArray(1) = 4 myArray(2) = 5 myArray(3) = 6 instead of just estting the variant to an array. HTH, Bernie MS Excel MVP > Why would the lower bound not always be one? Would not an array be > populated from 1 to x? [quoted text clipped - 73 lines] >> >> > This code takes about 45 minutes to go through 5000 records. Any >> >> > suggestions would be welcomed. > Why would the lower bound not always be one? Would not an array be > populated from 1 to x? You can have any lower and upper bound you want. Dim Arr(-100 To 100) As Long Debug.Print LBound(Arr), UBound(Arr) SignatureCordially, Chip Pearson Microsoft MVP - Excel Pearson Software Consulting www.cpearson.com (email on the web site) > Why would the lower bound not always be one? Would not an array be > populated from 1 to x? [quoted text clipped - 80 lines] >> >> > This code takes about 45 minutes to go through 5000 records. Any >> >> > suggestions would be welcomed. Take a look at this link: http://www.ozgrid.com/News/LookUpMatchIndexVBAFind.htm One of the FindBillyBrown() routines look close to what you want. >Is there an array pointer available in VBA? I use it in other languages to >easily and quickly sort and search arrays. My problem is I have two very >large spreadsheets and want to get data from one to the other based on a link >and the arraypointer would make this easier in my opinion. A simple vlookup >formula in the spreadsheet is very slow for a large qty of numbers so I don't >really want to use it. Any ideas? Richard -- |
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