Excel/VBA-Random 25% of cells selection in each columns based on specific criteria

Hello Everyone
Actually I'm working to extend existing Excel Add-ins, so im working with VBA(nice uh?).
Now I try to explain the project that I divide in two part, the first that i have already done and the second where my troubles begins.

What I need is to write a tool that based on specific criteria(ex: depending of the value in the rows) search for a certain values in all the cells for each column (I need to search in the cell for the string "DR1") then for each column, counting how many cells contain this value, then calculate the 25% of the total of cell founded and round it to the next greater value (ex:I found 4 cell containing "DR1" the 25% is = 1).
This was is the frist part of the problem that I have already coded without any great difficulty.
Now comes the second part that I'm stuck with.
So far what I have is something that loops trough the rows and columns, does some checks, add values to a counter, does some math and give me the result.
Now, I know what is the 25% of the result per column of the total of the values founded, but what I need now is using this value as a reference that set the number of cells that have to be selected from the cells founded for each column,but the selection has to be randomized.(ex: I found 8 cell in the column that contain the string "DR1" the 25% is 2, I have to randomly select 2 of these 8 cells in the column), I mean random like the selection has to be the randomized, not simply select the first two.
This is my problem... how to randomize the selections of the cells that have to be selected?This has to be done for each column(counting the cells, calculate the 25%, select at random the number of cell based on the percent.)
I said that I have to select the cells but what I really have to do is not really a selection but I have to leave the original color only for this cells and for the rest of cells (there is other cell with other values inside with different color) assign a grey color, but this is a part of code that I think I can do by myself without problem.

I hope that you guys have understand the problem and same good soul can help me.
Thnx in advance.
Regards

- dario -

This is the code that I wrote so far.

Sub Random_25()
ActiveSheet.Unprotect
CountPatientVisit LastPatientRow, LastVisitColumn
Dim site As String
Dim count
Dim roundCount
site = InputBox(prompt:="Enter the name of the site")

If site = "" Then Exit Sub

For j = 3 To LastVisitColumn
If Worksheets("Visit Patterns").Cells(3, j) = "0" Then
Dim rnd100
Dim rnd25
rnd100 = j + 1
rnd25 = j + 2
End If
Next

For j = rnd25 To LastVisitColumn
count = 0
For i = 3 To LastPatientRow
If (Worksheets("Summary").Cells(i, "A").Value = site) Then
If Worksheets("Summary").Cells(i, j).Value = "DR1" Then
count = count + 1
'MsgBox Worksheets("Summary").Cells(i, j).Value & " Col: " & j & " - " & count
End If
End If
Next
roundCount = Round(count * 0.25)
MsgBox " The 25% pecent of the total of: " & count & " DR1 in Column: " & j & " = " & roundCount
Next

End Sub
Sub CountPatientVisit(LastPatientRow, LastVisitColumn)

>>This is my problem... how to randomize the selections of the cells that have to be selected?<<

The way I would do it is with a RND() function. Basically:

Count the number of cells in the selected range. Lets say intSelect = 8.

Select the first cell by using the RND function:
intRndCell = Round((Rnd() * intSelect ) + 1) '<--------- This will give you an random number between 1 and 8

Now in a loop get the intRndCell. I would use a For Next loop with a counter. Once the counter equals intRndCell, that would be the cell you want.

Run through the process again to get the next cell. You will need to refigure the number of cells in the range to exclude the cell already selected.

If you put together some code for this, I would be more than happy to help you finish this.

Leon

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-dario-Author Commented:

Thnx Leon for your help the problem is that i have to select only the 25% of the, now i
generate the random numbers many as is the 25% of the total of values from a range from 1 to the total of values founded then i put the random number in an array.Now i don't know what to do for the last step that is pick only the number of cells that represent the 25% of the total of cells that contain the value that i search in random order and for these cells mantain the original color for all the others cell i have to change the color in grey.
here i s the code i wrote so far with more comments.
Thnx in advance
Sub Random_25()
ActiveSheet.Unprotect
'Call function that return rows and column bounds
CountPatientVisit LastPatientRow, LastVisitColumn
Dim site As String
Dim totalMatch
Dim quarterTotal
'site = InputBox(prompt:="Enter the name of the site")
site = "3/Beilan"
'site = "5/Collins"
If site = "" Then Exit Sub

For j = 3 To LastVisitColumn
'find the column position that contain a "0"
If Worksheets("Visit Patterns").Cells(3, j) = "0" Then
Dim rnd25
'add two at this value, because we start our search 2 column after the one with "0"
rnd25 = j + 2
End If
Next
'from this column to the last
For j = rnd25 To LastVisitColumn
totalMatch = 0
'from this row to the last
For i = 3 To LastPatientRow
'if the name of the site is the one that the user entered
If (Worksheets("Summary").Cells(i, "A").Value = site) Then
'and the value in the cell is DR1
If Worksheets("Summary").Cells(i, j).Value = "DR1" Then
'add 1 to the counter
totalMatch = totalMatch + 1
'for debugging only
'MsgBox Worksheets("Summary").Cells(i, j).Value & " Col: " & j & " - " & count
End If
End If
Next
'calulate the 25% of the total of DR1 founded and round it
quarterTotal = Round(totalMatch * 0.25)
'for debuging only
MsgBox " The 25% percent of the total of: " & totalMatch & " DR1 in Column: " & j & " = " & quarterTotal
'do this as many time as the calculated 25% value on quarterTotal
For i = 1 To quarterTotal
Dim cellToPick()
'make a dynamic array that store the random numbers of the length of the total
ReDim cellToPick(1 To quarterTotal)
Randomize ' Initialize random-number generator.
cellToPick(i) = Int((totalMatch * Rnd) + 1) ' Generate random values between 1 and totalMatch.
'for debugging only
MsgBox "Cell to pick in column " & j & " is cell number: " & cellToPick(i)

Next
Next

End Sub

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The way I would do it is with a RND() function. Basically:

Count the number of cells in the selected range. Lets say intSelect = 8.

Select the first cell by using the RND function:

intRndCell = Round((Rnd() * intSelect ) + 1) '<--------- This will give you an random number between 1 and 8

Now in a loop get the intRndCell. I would use a For Next loop with a counter. Once the counter equals intRndCell, that would be the cell you want.

Run through the process again to get the next cell. You will need to refigure the number of cells in the range to exclude the cell already selected.

If you put together some code for this, I would be more than happy to help you finish this.

Leon