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Variable Arguments Example (Visual Basic)

To create the component for this example, see Passing Variable Arguments. Then create a Microsoft Visual Basic application as follows:

1. Review the sample application for this example in matlabroot\toolbox\dotnetbuilder\Examples\VS8\NET\VarArgExample
   \VarArgVBApp\VarArgApp.vb.

   The program listing is shown here.

    VarArgApp.vb

   ' *******************************************************************************
   '
   '  VarArgApp.vb
   '
   ' This example demonstrates how to use MATLAB Builder NE to build a component
   ' with a variable number of input and output arguments.
   '
   ' Copyright 2001-2008 The MathWorks, Inc.
   '
   ' *******************************************************************************
   
   Imports System
   
   Imports MathWorks.MATLAB.NET.Utility
   Imports MathWorks.MATLAB.NET.Arrays
   
   Imports VarArgComp
   
   
   Namespace MathWorks.Demo.VarArgDemoApp
   
   
   ' <summary>
   ' This application demonstrates how to call components having methods with varargin/vargout arguments.
   ' </summary>
   Class VarArgDemoApp
       
   #Region " MAIN "
   
           ' <summary>
           ' The main entry point for the application.
           ' </summary>
           Shared Sub Main(ByVal args() As String)
   
               ' Initialize the input data
               Dim colorSpec As MWNumericArray = New MWNumericArray(New Double() {0.9, 0.0, 0.0})
               Dim data As MWNumericArray = New MWNumericArray(New Integer(,) {{1, 2}, {2, 4}, {3, 6}, {4, 8}, {5, 10}})
               Dim coords() As MWArray = Nothing
   
               Try
   
                   ' Create a new plotter object
                   Dim plotter As Plotter = New Plotter
   
                   'Extract a variable number of two element x and y coordinate vectors from the data array
                   coords = plotter.extractcoords(5, data)
   
                   ' Draw a graph using the specified color to connect the variable number of input coordinates.
                   ' Return a two column data array containing the input coordinates.
                   data = CType(plotter.drawgraph(colorSpec, coords(0), coords(1), coords(2), coords(3), coords(4)), _
                                MWNumericArray)
   
                   Console.WriteLine("result={0}{1}", Chr(10), data)
   
                   Console.ReadLine()  ' Wait for user to exit application
   
                   ' Note: You can also pass in the coordinate array directly.
                   data = CType(plotter.drawgraph(colorSpec, coords), MWNumericArray)
   
                   Console.WriteLine("result=\{0}{1}", Chr(10), data)
   
                   Console.ReadLine()  ' Wait for user to exit application
   
   
               Catch exception As Exception
                   Console.WriteLine("Error: {0}", exception)
               End Try
           End Sub
   #End Region
   
       End Class
   End Namespace
   

   The program does the following:

   • Initializes three arrays (colorSpec, data, and coords) using the MWArray class library

   • Creates a Plotter object

   • Calls the extracoords and drawgraph methods

   • Uses MWNumericArray to handle the data needed by the methods

     Note   For complete reference information about the MWArray class hierarchy, see the MWArray Class Library Reference (available online only).

   • Uses a try-catch-finally block to catch and handle any exceptions

   The following statements are alternative ways to call the drawgraph method:

   data = CType(plotter.drawgraph(colorSpec, coords(0), coords(1), coords(2), coords(3), coords(4)), MWNumericArray)
   ...
   data = CType(plotter.drawgraph(colorSpec, coords), MWNumericArray)

2. Build the VarArgApp application using Visual Studio .NET.

   1. The VarArgVBApp folder contains a Visual Studio .NET project file for this example. Open the project in Visual Studio .NET by double-clicking VarArgVBApp.vbproj in Windows Explorer. You can also open it from the MATLAB desktop by right-clicking VarArgVBApp.vbproj > Open Outside MATLAB.

   2. Add a reference to the MWArray component, which is matlabroot\toolbox\dotnetbuilder\bin\architecture\framework_version
      \mwarray.dll.

   3. If necessary, add (or update the location of) a reference to the VarArgComp component which you built in a previous step. (The component, VarArgComp.dll, is in the \VarArgExample\VarArgComp\x86\V2.0\Debug\distrib subfolder of your work area.)

3. Build and run the application in Visual Studio .NET.

Create Plot Example (Visual Basic)

Spectral Analysis Example (Visual Basic)

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