Graph troubles again

Hiya, just when I thought I had ms chart sussed too, sigh... :-)

I need to be able to plot a line of best fit on my graph, is that possible? could anyone tell me how it's done?

thanks for you time :)
Ang

I don't know how. It sounds like statistical something or other. I'll ask brother who may know. In the mean time, go to this link and see if you can find something under Statistics that helps you.

http://www.hoxie.org/math/title.htm

argh .. mschart ...

i never had much success with that piece of crap ...

you can always do what you asked for with an excel reference if that is an option for you ...

how does that excel way work? that sounds handy

i found a way to get a line of best fit, using least squares blah. Had to look back to my old school stats :-). But anyway, now i am able to get the formula into a string, now the next fun part will be getting that on the graph.

stupid graphs :P
Ang

I use the chart control and don't have problems with it. I just use it to display data though. In other words, the user can change the look and copy it to other applications, but I don't let them change values in the chart itself. It's read-only

You'll have to remove some of my function calls, but I'm leaving them in this code because the names are self-explanatory and it will help you see what I did better.

VB Code:

Public Function GraphQuery() As Long
Dim i As Long
Dim j As Long
Dim RST As Recordset
Dim iRecordcount As Long
Dim iFieldCount As Long
 
On Error GoTo errHandler
 
Dim sData() As String
 
Set RST = DB.OpenRecordset(BASE_QUERY, dbOpenSnapshot)
iRecordcount = CountRecords(RST)
iFieldCount = RST.Fields.Count
 
If iFieldCount <= 0 Then Exit Function
 
If iRecordcount - 1 < 0 Then
  MsgBox "No records to graph.", vbInformation, APP_TITLE
  Exit Function
End If
 
ReDim sData(iFieldCount - 1, iRecordcount - 1)
 
For i = 0 To iFieldCount - 1
  For j = 0 To iRecordcount - 1
    sData(i, j) = RST.Fields(i).Value
    RST.MoveNext
  Next j
  RST.MoveFirst
Next i
 
RecordsetClose RST
 
chtGraph.ChartData = sData
 
Exit Function
 
errHandler:
GraphQuery = Err
 
End Function

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