Maximize Performance Of Array In VBA
Jun 20, 2007
I'm trying to write some code that is performing operations on large arrays, using a pair of For loops. In languages like C++ and Fortran, it makes a big difference to the performance of the code which way round you put these 2 For loops, due to the way that array data is stored in the computer memory. However, for VBA, I've no idea which way round this is. For an array, A(i,j), do I want
For i = 1 To N
For j = 1 To M
A(i,j) = Cells(j, i).Value
Next j
Next i
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Jun 26, 2007
I have a list of employees who each have a performance rating (very top, consistent, etc). Each employee is also either above the midpoint of a salary range or below (which is represented by a separate column with 'Yes' for above and 'No' for below).
What I am trying to do is apply a separate set of %'s for each group of employees. So, for the employees who are below, I want to return 10% and 8% for each respective rating, but for those employees who are above, I want to return 8% and 6%. (for example).
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Sep 18, 2013
Recently my friend forced Excel to close through Task Manager by Ending the Proccess... Since he did that, every .xls(x) file do not opens. No errors. Just Excel Icon on taskbar appears.... as it is minimized... But it doesn't minized.. Either this icon on a taskbar is minimized Excel icon, or this just an icon ....
RepairedReinstalleUpdated
No result ...
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Jan 13, 2014
Any way to set up Solver in order to maximize revenue, but with the constraints equaling ONLY one of two values (e.g. 0 or 100)?
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Jul 22, 2014
I am trying to maximize fantasy football points based on projected points scored, salary and positional limits.
I have multiple sheets dedicated one per position (i.e. sheet named "QB", sheet named "RB", etc.). The relevant columns are: Name; FPT (projected points); Cost
NOTE: I have combined all the data into "sheet1" if necessary.
I need a VBA program or Solver to diagnose the largest possible combination of projected points based on the following constraints:
Constraint 1: Total value must be less-than or equal to $1,000,000
Constraint 2: Total players used must be equal to 10
Constraint 3-?: Of the 10, 2 must be QB, 2 must be RB, 2 must be WR, 1 must be TE, 1 must be DEF.....the other 2 can be RB, WR or TE
Obviously, each player can only be used once and I'm not sure if Solver can abide by that constraint, nor do I know how to apply the others. I'm thinking VBA could work, but I'm not familiar enough with the language to hammer out the code.
I have a small macro that downloads some data from a website and tweaks it Daily fantasy cheatsheet.zipa little, but I hope that won't affect any computations involving those values.
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Feb 1, 2014
I am currently putting together a Directory and want each of the 19 programs and the worksheets to be maximized when they are opened.
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Dec 3, 2011
Using Excel 2010.
I am building a dashboard and would like to maximize the print area so everything fits on 1 sheet 8 1/2 x 11 landscape.
My settings at this point:
Margins:
Top 0.25
Right 0.25
Bottom: 0.25
Left 0.25
Row Height 7.5
Column Width 1.29
Seems small, I know but as I develop charts, titles, infographics, etc... I will merge rows and columns as needed so as to leave just enough white space for clarity while packing critical information into 1 sheet.
My problem - as I keep playing with maximimizing number of columns and rows Excel keeps scaling. Is there a way to calculate the correct number of rows and columns to maximize the available space?
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Aug 31, 2007
Edges of worksheet have gone - no tabs, no minimise/maximise.
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Nov 10, 2006
I have a relatively small Excel workbook that is using numerous lookup and Match function combinations. I also have a number of dynamic ranges defined and a few UDFs.
Problem is I am encountering some fairly severe performance issues. Changing a single value on a sheet is taking ages.
I suspect it may be due to the workbook dynamic ranges recalculating. Is there a limit to the amount of dynamic ranges in a workbook? And when do they get recalculated? Could it be something to do with sequencing of the calculations?
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Nov 6, 2008
I am trying to work out a % score for a telephone operator. To explain further, I would monitor a call that an agent takes. The agent starts at 100%. There are 20 points to be scored and they are scored like this
1 - Yes
0 - No
left blank - n/a
B3 counts the number of entries in the column
B2 counts the number of 1's in the column
B28 = B2/B3
Seems to work fine until the agent makes a fail which would enter a 0 in the column. Somewhere I think I need to take account that there are 20 possible fails or passes?
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Sep 8, 2009
I need formula to calculate a fee based on performance. For example I have 4 unique keys with the following performance:
KEYPerformance
2010,000
2120,000
2230,000
2340,000
I need to work out how I can formula drive a fee calculation based on performance which is subject to different ranges:
KEYMin FeeFee 1Fee 2Fee 3Fee 4
201000.10.20.30.4
211000.10.20.30.4
221000.10.20.30.4
231000.10.20.30.4
For example key 20 has a min fee chargeable of 100, however a fee is chargable based on performance as follows:
Fee Range 10-9999
Fee Range 210000-19999
Fee Range 320000-29999
Fee Range 430000-99999999
So key 20 gets charged 0.1% of amounts between 0&9,999, 0.2% of amounts between 10,000&19,999, 0.3% on amounts between 20,000& 29,999 and 0.4% on the rest.
How can this be combined into a lookup/range/low-high formula to extract the correct values????
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Oct 2, 2008
Morning all. I'm trying to use VBA to generate autoshape arrows to track changes in values.
Something allong the lines of Column B (Jans data) C (Febs Data) E (autoshape arrow, green up, for improvement, or red downwards for a worsening).
The problem I'm having is postioning my autoshapes. The only way I can do it at present is to keep all columns and rows a standard width, and position using multiples of those.
Is there anyway to set the autoshape to the cell height and width, and position it within the boundries of the cell? This way I don't have to worry about rewiting my code every time I change a cell width?
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Nov 23, 2009
I am encountering a situation wherein each line of VBA code is essentially compiled as I type on that line, instead of when I move to a different line. For example, if the code I entered is incorrect, the compiler waits about half a second and then turns it red. Also, if I enter a space, it deletes it immediately.
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Jan 17, 2013
I have thousands of rows of data sorted chronologically in a flat list. What I'm looking to do is have a pivot table or formula which picks out the highest value for a given person. Sound simple?
Okay,
- column A: date
- column B: name
- column C: exercise weight
- column D: exercise rep's
- column E: exercise predicted max (essentially, weight x reps)
Now, I have a pivot table which picks out each persons highest "exercise predicted max" (right click on table, field settings, MAX) but I want to know the actual weight they've lifted and how many reps they've done with it.
So basically, I want a simple table which shows me the date, persons name, heaviest weight they've lifted and how many reps they did with it. I've used the CONCATENATE function to group the "exercise weight" and "exercise rep's" in to one cell but the pivot doesn't return any values (all cells in pivot = 0).
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Jun 4, 2008
I run a simple macro loop to clean some data across nine columns. The purpose is to collapse the data in the columns so that column 1 has the first value found in that row, for the set of columns. For instance, if columns 1-4 are empty, it deletes / shifts everything left until the first column is not empty. Then it goes to the next row and repeats. Data can range from a few rows up to 6000.
[I have a period in the data as the cell content to evaluate]
Sub A_Rollup_collapse()
StartT = Now
Dim Col As Integer
Col = Range("IV1").End(xlToLeft).Column - 9
LastR = Range("A60000").End(xlUp).Row
Application.ScreenUpdating = False
For R = 2 To LastR
Do While Cells(R, Col) = "."
Cells(R, Col).Delete Shift:=xlShiftToLeft
Loop
Next R
EndT = Now
Application.ScreenUpdating = True
msg = "Done. Duration: " & Format(EndT - StartT, "h:mm:ss")
MsgBox (msg)
this macro (B) runs after another macro (A) that populates the nine columns with data using vlookups. Macro (A) It builds out a chain of information from col 2 to col 9, converts to values etc. Nothing odd.
When macro (B) is called right after running macro (A), it can take about one minute for 500 rows of data.
When I save and close the workbook, reopen it and run macro (B), it only takes one second.
When I insert a ThisWorkbook.Save between the two call statments, macro (B) still takes over a minute.
A minute is not too bad but when I'm dealing with thousands of rows, the difference is more like 30 seconds vs. 9 minutes which is a problem.
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May 1, 2009
I've a sheet that records performance on individuals, what it does is collate the performance daily on certain things.
Most are simple plus/minus one and i have control buttons that do this,what it does is: On click it adds one to a different sheet, or if to remove it minuses one, and there is a total box to sum these figures.
But there is also some provision to add collected money value, and what i would like to do is have a function that deletes the last figure added to the financial transactions
This is the code
If Target.Address = "$A$6" Then Sheets(2).Range("A65536").End(xlUp).Offset(1).Value = Target.Value
So for example
in A6 £10.50 is added, but i can't think how i can provide a service that will delete the last figure in Sheet 2 range A, as this will be constantly changing.
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Aug 19, 2006
I have built a fairly complex app in excel which takes 50 webqueries and makes a table out of specific data. It generally takes ~34 seconds to run through the webqueries, and when its done, it starts all over and runs the 50 queries again on 30 second delays. My problem is that for about 5-10 of these cycles, everything works fine, but after that, the time per set of queries starts going up...in the range of 2:00 or more for the same 50 webqueries that originally took ~34 seconds.
Without posting each of the userforms and modules, is there a general way to clear out the memory or see whats bogging down the process or anything between sets of queries to maintain performance? the webquery itself is a
With ActiveSheet.QueryTables.Add(Connection:= "string" & variable
statement that gets called each of the 50 times. The only thing I can think of is that somehow variables or some other procedure isnt clearing after each of the sets of 50 queries runs. Is there any way to check that or make sure it is cleared before it begins the 50 query set again? I noticed this mostly by watching my "physical memory avaliable" drop a small amount each time the set ran, and I had to quit excel before it would return to its original amount.
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Aug 24, 2006
why it takes about 100 times longer to set a value using a named range. The code below demonstrates the huge difference between Range("A1") and Range("my_range")
Public Sub testloop()
Dim counter As Long
Dim start As Double
start = Timer()
Application.Calculation = xlCalculationManual
Application. ScreenUpdating = False
For counter = 1 To 34000
Range("my_range") = 9999 ' 101 seconds
'Range("A1") = 9999 ' 1.2 seconds
Next counter
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Mar 4, 2014
What I'm trying to do is show monthly performance based on products of a few different areas. Where I'm running into problems, is with the month listings. If the report shows one month at a time, I can get it to work with SUMIF formulas, however when there is more than one (and there will always be three).
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Jul 3, 2014
I have a home finance spreadsheet that I've been using for a few years and in the last couple of days it's ground to a halt. Whenever I enter a value in a cell and hit [ENTER] there is a long delay with the spinning wait icon (Windows 7) and the Excel window reports "Not responding". Eventually (3-4 minutes) the update occurs and everything is fine.
The workbook has 9 sheets on it but only one summary sheet references the others. The sheet I'm updating has about 2200 rows, 50 columns and the formulas are simple A+B-C types. Performance DOES NOT improve if I change recalculation to manual. The only VBA is some macros to perform tasks and they don't execute dynamically. Adding comments and changing formats responds immediately, it is only updating values that exhibits the problem.
I've tried replacing all formulas with their values (paste special/values) across the sheet but again this didn't work.
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Aug 23, 2006
Im having slow performance reading a CSV file into 34000 sheet named ranges. Currently it takes about 8 minutes to read 34,000 records. After stepping through the code Ive realized there are two bottle necks.
1)finding which sheet that the range name resides see getRangeAddress() and
2) actually setting the value to the named range i.e. Range(ra) = dprecord(1)
The CSV file looks like this: <range name>,<data value>
e.g. DPA_1001,99090
Performanace actually seem to slow as the macro runs.
Public Sub readDatapoints()
'Macro readDataPoints
'This macro will read in the a comma seperated value (CSV) file of datapoints.
Dim sFile As String
Dim currentLine As String
Dim delimit As String
Dim counter As Integer
Dim ra As String
Dim fs As Object
Dim ts As Object
Dim dprecord
Dim oldStatusBar As Boolean
delimit = ","
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Jan 3, 2014
Looking to create a system to measure KPI (key performance indicators). I need to include a weekly target and then measure performance for that week against the target. I want to create a form to make data entry simple, how best it would be to implement using excel. Would I have 2 tables, one for targets and one for performance and then use look ups, [URL]
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Jan 11, 2010
I designed a spreadsheet which uses a lot of VLOOKUPs and it takes a very long time to recalculate. I don't know if there is another way I could do this, but this just seemed to make sense and it works just the way we want it but it just takes too long. Here is what the spreadsheet is designed to do:
We have data that is pasted into excel from another source. The data is broken up into account number, date, check number, and amount. Multiple payments from the same account can occur in one month so the data must be totaled. There is a custom function called concatif which works just like sum if but concatenates text. There are VLOOKUPs performed on the account number and the corresponding date, check number, and amount are inserted in the table.
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Apr 16, 2006
I have a data base for a stock.
It goes like this:
Date Price
Date1 Price1
Date2 Price2
How can I do an analysis of the:
Worst 12mths performance (like how much is the maximum a stock drop in any rolling 12mths period)
best 12 mths performance
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Jun 19, 2014
I have a list of employees split out into gender and performance rating. I want to graph this to compare male to female salaries and performance. Data attached.
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Apr 26, 2013
If I want to improve my excel performance like ability to open multiple excel and sheets to perform calculation, should I change to a SSD or a faster intel chip? My current PC sometimes give me a black screen for my excel sheet or is unable to save certain sheets when I open too many sheets.
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Oct 24, 2013
I created a table where based in several competences anyone can evaluate performance and potential. My issue comes when based on that result (colum Y in "Perf&Pot" Sheet) I want to export that to a nine box matrix (Sheet 2 "grid" in the attached excel). As could be several people in the same box I wasn't able to com up with a formula that solves this.
Pasta1.xlsx
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Jul 30, 2012
in C a string is nothing more than an Array of characters ending with a null character.
in VBA this does not seem to be the case.I am trying to use the BlowFish code from David Midkiff for some encryption, however the code sometimes fails:
When encrypting a string a string of a specific length should be returned. however sometimes one of the characters of the encrypted string is a null character, and the returned encrypted string (with a embedded null character) is causing me problems. I want to check for the null character and if present redo the encryption. But how do I check for the presence of this null character in a unicode (double-byte) string?
Checking with Len(encrypted) gives the correct length (!) but trying to move each (unicode)character into an array fails when using the Mid() function past the null character in the string.
Now I can use
byteArray() = StrConv(unicodetext,vbFromUnicode)
to get the lower byte of each character into an array easily, but how do I do this for both bytes of the unicode characters?
Using an integer array does not work other than through
intArray(j) = CInt(AscW(Mid(Outp, j, 1)))
which fails on the nullstring in my encrypted text.
I have tried with variants but so far no luck. I thought if the string was entered into a variant then I could also address the variant as an array of bytes, but that does not seem to be accepted by VBA.
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Sep 9, 2012
I am trying to populate many arrays with the same code using something like this. For this test, assume the following data in A1.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Code:
Sub populate()
Dim firstArr(5), secondArr(5), thirdArr(5), fourthArr(5), fifthArr(5) As Integer
Dim r, c, num As Integer
[Code]....
The above code does not work of course and falls over. I am unsure whether I should try and concatenate with something like this eg "" & arrName(i) = Cells (r,c) or go down a different route.
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Dec 20, 2013
I need to export this to Xcelsius which doesn't support any macros/vba. Btw I can;'t use Row() in xcelsius too.
[Code].....
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