TREND Function Works Differently in Functions Than in Macros (171719)

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Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements. You can use the TREND function in a custom function like you do in a spreadsheet. For example, the following function works correctly when called by a formula in a worksheet:

   Function NewTrend(KnownYs, NewXs)
 
      NewTrend = Application.Trend(KnownYs, , NewXs, True)
 
   End Function
				

However, if this function is called by a subroutine in a module, one of the following error messages appears.

Microsoft Excel 97

Microsoft Excel 5.0 and 7.0, Microsoft Excel 98

When you use similar code in the Sub procedure, these error messages also appear. For example, the error messages appear when you run the following code in a Sub procedure:

   Sub TrendError()
      MsgBox Application.Trend(Worksheets(1).Range("A1:D1").Value, , _
         5, True)
   End Sub
				

Using the TREND Function in a Sub Procedure

The methods in this article for using a TREND function in a Sub procedure require that the argument for new x's be passed as a Single or a Double data type. Note that the TREND function also returns an array and that it is necessary to pull the desired element to view the result of the function.

Microsoft Excel 97: The following sample macro uses a TREND function in a Sub procedure in Microsoft Excel 97:

   Sub GoodTrend()
 
      Dim NewXs as Single
      NewXs = 5
      Result = Application.WorksheetFunction.Trend( _
         Worksheets(1).Range("A1:D1").Value, , NewXs, True)
      MsgBox Result(1)
 
   End Sub
				

Microsoft Excel 5.0 and 7.0 and Microsoft Excel 98:

The following sample macro uses a TREND function in a Sub procedure in Microsoft Excel 5.0, 7.0, and 98:

   Sub GoodTrend()
 
      Dim NewXs as Single
      NewXs = 5
      Result = Application.Trend(Worksheets(1).Range("A1:D1").Value, _
         , NewXs, True)
      MsgBox Result(1)
 
   End Sub
				

NOTE: This macro works with horizontal or vertical ranges.