aaronwk
asked on
dotNetCharting - how to calculate percentage on data from 2 different series
I have a chart with 2 series added to it. The first series is for total orders. The second series is the count of orders that are from repeat customers. I would like to add a 3rd series that is the calculated percentage. Basically just dividing the second series by the first one. I can't seem to figure out the syntax to make that work.
I am using the latest release from dotnetcharting.com
I am using the latest release from dotnetcharting.com
Dim sc As New SeriesCollection()
RepeatCustomers.Debug = True
RepeatCustomers.Title = "Repeat Customers"
RepeatCustomers.XAxis.FormatString = "MMMyy"
RepeatCustomers.LegendBox.Orientation = dotnetCHARTING.Orientation.Bottom
RepeatCustomers.DateGrouping = TimeInterval.Months
Dim sd As DateTime = New System.DateTime(2007, 5, 1, 0, 0, 0) '5/1/2007
Dim ed As DateTime = New System.DateTime(Year(Now), Month(Now), Day(Now), 23, 59, 59)
'Add a series
Dim sql As String = "SELECT OrderDate,1 AS q FROM Orders WHERE OrderDate >= '" & sd.ToString & "' AND OrderDate <= '" & ed.ToString & "' ORDER BY OrderDate"
Dim df As New Series()
df.ConnectionString = ConfigurationManager.AppSettings("DNCConnectionString").ToString
df.StartDate = sd
df.EndDate = ed
df.Type = SeriesType.Cylinder
df.DefaultElement.ShowValue = True
df.Name = "Total Orders"
df.SqlStatement = sql
df.DefaultElement.Transparency = 50
sc.Add(df)
'repeat customer orders
Dim sql2 As String = "query selects quantity of orders from repeat customers)"
Dim rs As New Series()
rs.Name = "Repeats"
rs.SqlStatement = sql2
rs.DefaultElement.Transparency = 50
rs.Type = SeriesType.Cylinder
rs.DefaultElement.ShowValue = True
rs.ConnectionString = df.ConnectionString
sc.Add(rs)
RepeatCustomers.SeriesCollection.Add(sc)
ASKER
Yea, i've tried just about everything including that. I've been through all the help files to no avail. I found what i thought would work which is Series.Divide but no dice. What's so strange is that if i manually create a series with elements these techniques work great. As soon as my series is attached to sql server for data it does not work. I'm pretty sure it's a bug in their component. When i do series.elements.count of a series filled from the sql server connection the count is 0 yet it displays fine on the chart.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Series s3 = s1 / s2;
You may also want to take a look at the data tutorial
http://www.dotnetcharting.com/documentation/v5_2/Data%20Manipulation.html
Hope this helps,
Dustin