Learn more about MATLAB Builder NE

Create Plot Example (Visual Basic)

To create the component for this example, see Simple Plot Example. Then create a Visual Basic application as follows:

1. Review the sample application for this example in
   matlabroot\toolbox\dotnetbuilder\Examples\VSversionnumber\NET\PlotExample
   \PlotVBApp\PlotApp.vb.

   The program listing is shown here.

    PlotApp.vb

   ' *******************************************************************************
   '
   ' PlotApp.vb
   '
   ' This example demonstrates how to use MATLAB Builder NE to build a component 
   ' that displays a MATLAB figure window.
   '
   ' Copyright 2001-2008 The MathWorks, Inc.
   '
   ' *******************************************************************************
   
   Imports System
   
   Imports MathWorks.MATLAB.NET.Utility
   Imports MathWorks.MATLAB.NET.Arrays
   
   Imports PlotComp
   
   
   Namespace MathWorks.Examples.PlotApp
   
       ' <summary>
       ' This application demonstrates plotting x-y data by graphing a simple 
       ' parabola into a MATLAB figure window. 
       ' </summary>
       Class PlotDemoApp
   
   #Region " MAIN "
   
           ' <summary>
           ' The main entry point for the application.
           ' </summary>
           Shared Sub Main(ByVal args() As String)
               Try
                   Const numPoints As Integer = 10  ' Number of points to plot
                   Dim idx As Integer
                   Dim plotValues(,) As Double = New Double(1, numPoints - 1) {}
                   Dim coords As MWNumericArray
   
                   'Plot 5x vs x^2
                   For idx = 0 To numPoints - 1
                       Dim x As Double = idx + 1
                       plotValues(0, idx) = x * 5
                       plotValues(1, idx) = x * x
                   Next idx
   
                   coords = New MWNumericArray(plotValues)
   
                   ' Create a new plotter object
                   Dim plotter As Plotter = New Plotter
   
                   ' Plot the values
                   plotter.drawgraph(coords)
   
                   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:

   • Creates two arrays of double values

   • Creates a Plotter object

   • Calls the drawgraph method to plot the equation using the MATLAB plot function

   • Uses MWNumericArray to handle the data needed by the drawgraph method to plot the equation

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

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

   The statement

   Dim plotter As Plotter = New Plotter

   creates an instance of the Plotter class, and the statement

   plotter.drawgraph(coords)

   calls the method drawgraph.

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

   1. The PlotVBApp folder contains a Visual Studio .NET project file for this example. Open the project in Visual Studio .NET by double-clicking PlotVBApp.vbproj in Windows Explorer. You can also open it from the MATLAB desktop by right-clicking PlotVBApp.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 fix the location of) a reference to the PlotComp component which you built in a previous step. (The component, PlotComp.dll, is in the \PlotExample\PlotComp\x86\V2.0\Debug\distrib subfolder of your work area.)

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

Magic Square Example (Visual Basic)

Variable Arguments Example (Visual Basic)

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