Using the LinEst function and return values in a column of variable length - excel

Question

I am trying to use the LinEst function to take values from a range of rows of data and input them into a new sheet under some headings. I only want to do this for a particular number of rows (up to row number defined as "c". My VBA skills are very basic.
Sub Button7_Click()
Sheets.Add.Name = "Down Sweep Power Law"
Dim xrng As Range, yrng As Range
Dim i As Long
Dim Rng As Range
Dim l As Long
Dim k As Long
Dim i2 As Long
Dim c As Long
Dim j As Long
Dim drop As Range
Dim drop2 As Range
Dim DownSweep As Chart, UpSweep As Chart, cht As Chart
Dim ws As Worksheet, smallest
Dim dsws As Worksheet
Set ws = Worksheets("Template") '<< use variables for worksheets!
Set dsws = Worksheets("Down Sweep Power Law")
Set Rng = ws.Range(ws.Range("B11"), ws.Range("B11").End(xlDown))
smallest = WorksheetFunction.Small(Rng, 1)
l = Rng.Find(what:=smallest, LookIn:=xlValues, lookat:=xlWhole).Row
k = Rng.Rows.Count
c = l - 10
Set xrng = ws.Range("C11:CP11")
Set yrng = ws.Range("C201:CP201")
Set drop = dsws.Range("A2")
Set x2rng = xrng.Offset(1, 0)
Set y2rng = yrng.Offset(1, 0)
Set drop2 = drop.Offset(1, 0)
dsws.Range("A1").Value = "(n-1) Value"
dsws.Range("B1").Value = "log(k) Value"
dsws.Range("C1").Value = "(n-1) Value"
dsws.Range("D1").Value = "n Value"
dsws.Range("E1").Value = "R Value"
If i < c Then
Set drop = Application.LinEst(Log10(yrng), Log10(xrng), True, False)
i = i + 1
End If
ITERATE:
If i < c Then
Set drop2 = Application.LinEst(Log10(y2rng), Log10(x2rng), True, False)
x2rng = x2rng.Offset(1, 0)
y2rng = y2rng.Offset(1, 0)
drop2 = drop2.Offset(1, 0)
i = i + 1
GoTo ITERATE
End If
End Sub
the code runs but when I go on the created sheet, there is a #NAME error (2029) and no values are present.
Is there a way to fix this?
Any help would be appreciated.

Answer 1

I think you have omitted a step from your plan. LinEst returns an array and you want to assign the values in that array to the range Drop. You can't assign the array directly to the range. Please try this code.
Option Explicit
Sub Button7_Click()
Dim xrng As Range, yrng As Range
Dim Drop As Range
Dim Arr As Variant ' LinEst result array
Dim Rng As Range
Dim R As Long
Dim l As Long
Dim k As Long
Dim i2 As Long
Dim c As Long
Dim j As Long
Dim DownSweep As Chart, UpSweep As Chart, cht As Chart
Dim ws As Worksheet, Smallest As Variant
Dim dsws As Worksheet
Set ws = Worksheets("Template") '<< use variables for worksheets!
Sheets.Add.Name = "Down Sweep Power Law"
Set dsws = Worksheets("Down Sweep Power Law")
Set Rng = ws.Range(ws.Range("B11"), ws.Range("B11").End(xlDown))
Smallest = WorksheetFunction.Small(Rng, 1)
l = Rng.Find(what:=Smallest, LookIn:=xlValues, LookAt:=xlWhole).Row
k = Rng.Rows.Count
c = l - 10
Set xrng = ws.Range("C11:CP11")
Set yrng = ws.Range("C201:CP201")
Set Drop = dsws.Range("C2:CP2").Offset(0, -2)
dsws.Range("A1").Value = "(n-1) Value"
dsws.Range("B1").Value = "log(k) Value"
dsws.Range("C1").Value = "(n-1) Value"
dsws.Range("D1").Value = "n Value"
dsws.Range("E1").Value = "R Value"
Do While R < c
Arr = Application.LinEst(Log10(yrng), Log10(xrng), True, False)
Drop.Value = Arr ' or perhaps: = Application.Transpose(Arr)
Set xrng = xrng.Offset(1, 0)
Set yrng = yrng.Offset(1, 0)
Set Drop = Drop.Offset(1, 0)
R = R + 1
Loop
End Sub
I don't know what kind of array LinEst will return. You may have to transpose the result.
I also tried to improve your management of ranges. However, the code is entirely untried, for lack of data. There may be logical errors in my code as well as typos but the syntax should be sound. It may not take you all the way over the finish line but I hope it will help you in your quest.