Running a calculation function for n number of rows - excel

Question

I want to automate a calculation for a measurement data Excel file.
While I made the function work, I could only figure out how to do that for one row at a time. The calculation is specific to the data on every row.
I thought I could change the Range("J3") value to Range("J3:J52") for a capacity of 50 calculations.
How do I make the function calculate for every row, separately, using the data of said specific row?
It doesn't matter if it runs for all 50 rows or if I have to figure out some loop function to find how many rows to calculate for, as long as one button press in the end will make the magic happen.
I have included a screenshot of the sheet for reference, the main calculation is done in Excel, but what this is doing is choosing the correct option out of a few different correction calculations and explaining to the user why.
I think there are some unnecessary Dim lines at the start but if it runs, I wasn't going to remove them.
'The main function, activated by a simple button Sub'
Function ISO16032()
'DeltaL Range'
Dim DeltaL As Range
Set DeltaL = Range("F3")
'Result is the corrected value in G column'
Dim Result As Long
'Note is the calc note in H column'
Dim Note As String
'X is the DeltaL between noise and background noise'
Dim x As Long
x = Range("F3").Value
Select Case Range("F3").Value
'No correction when X = > 10'
Case 10.6 To 200
Result = Range("J3")
Range("G3").Value = Result
Note = "No correction"
Range("H3").Value = Note
'Correction according to ISO16032 when X = between 4 and 10'
Case 3.6 To 10.5
Result = Range("K3")
Range("G3").Value = Result
Note = "Correction per ISO16032"
Range("H3").Value = Note
'Maximal correction value set to 2,2 dB if X < 4'
Case 0.1 To 3.5
Result = Range("L3")
Range("G3").Value = Result
Note = "Correction limit set to 2,2 dB"
Range("H3").Value = Note
'If x = < 0, the measurement is invalid'
Case Else
Note = "Repeat measurement!"
Range("H3").Value = Note
End Select
End Function

Answer 1

Hi and welcome to stackoverflow, I think that a simple loop, with the addition of an argument to your ISO function allows you to solve your problem like this
Sub Looping()
For i = 3 To 52
' Convert i to String because we need to concatenate with the letter F, G, H...
Call ISO16032(CStr(i))
Next
End Sub
Function ISO16032(Cell_X)
'DeltaL Range'
Dim DeltaL As Range
Set DeltaL = Range("F" + Cell_X)
'Result is the corrected value in G column'
Dim Result As Long
'Note is the calc note in H column'
Dim Note As String
'X is the DeltaL between noise and background noise'
Dim x As Long
x = Range("F" + Cell_X).Value
Select Case Range("F" + Cell_X).Value
'No correction when X = > 10'
Case 10.6 To 200
Result = Range("J" + Cell_X)
Range("G" + Cell_X).Value = Result
Note = "No correction"
Range("H" + Cell_X).Value = Note
'Correction according to ISO16032 when X = between 4 and 10'
Case 3.6 To 10.5
Result = Range("K" + Cell_X)
Range("G" + Cell_X).Value = Result
Note = "Correction per ISO16032"
Range("H" + Cell_X).Value = Note
'Maximal correction value set to 2,2 dB if X < 4'
Case 0.1 To 3.5
Result = Range("L" + Cell_X)
Range("G" + Cell_X).Value = Result
Note = "Correction limit set to 2,2 dB"
Range("H" + Cell_X).Value = Note
'If x = < 0, the measurement is invalid'
Case Else
Note = "Repeat measurement!"
Range("H" + Cell_X).Value = Note
End Select
End Function
EDIT: think indented your code like I did to make it more readable too (or like #Darren Bartrup-Cook did when editing your question)

Answer 2

This is more of an example of how to calculate each row.
Just getting your code to work across multiple rows.
Cells
With...End With Statement
'No need for Sub to call function that doesn't return anything.... just write a sub.
Public Sub ISO16032()
Dim LastRow As Long
With ThisWorkbook.Worksheets("Sheet1")
LastRow = .Cells(.Rows.Count, 10).End(xlUp).Row
Dim RowCounter As Long
Dim Result As Long
Dim Note As String
'Only calculate if there is data in rows 3 onwards.
If LastRow >= 3 Then
'Reset results on each pass.
'Assuming -1 is an impossible answer so code knows
'not to put anything on Case Else.
Result = -1
Note = ""
'Cycle through each row and calculate.
For RowCounter = 3 To LastRow
Select Case .Cells(RowCounter, 6) 'Look at column F(column 6) on each row.
Case 10.6 To 200
Result = .Cells(RowCounter, 10)
Note = "No corrections."
Case 3.6 To 10.5
Result = .Cells(RowCounter, 11)
Note = "Correction per ISO16032"
Case 0.1 To 3.5
Result = .Cells(RowCounter, 12)
Note = "Correction limit set to 2,2 dB"
Case Else
Note = "Repeat measurement!"
End Select
'Place results on sheet.
.Cells(RowCounter, 7) = IIf(Result >= 0, Result, "")
.Cells(RowCounter, 8) = Note
Next RowCounter
End If
End With
End Sub