Error in MATLAB COM Automation

Anyone knows how to do MATLAB COM autiomation in VB.NET? Since I really can't make my program works using the NE builder. I tried using the COM automation as documented here: http://www.mathworks.com/help/matlab/matlab_external/call-a-matlab-function-from-visual-basic-net-client.html

Again, my program is so simple. Here's the matlab code:

function out = addMe(a,b)
out = a + b;
end

Here's the VB code:

Public Class Form1
    Dim a As Integer = 4
    Dim b As Integer = 10
    Dim result As String
    Dim Matlab As Object

      Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
          Matlab = CreateObject("Matlab.Application")
          result = Matlab.Execute("cd C:\Users\Elvin Gentiles\Desktop\Program")
          result = Matlab.Execute("addMe(a,b)")
          TextBox1.Text = result
      End Sub
End Class

The result that I'm getting that is showing in the textbox is: ? ?? Undefined function or variable 'a' . I already made sure that the COM reference is already added.

But when I tried changing the code to this it is working.

result = Matlab.Execute("version")

I hope you can help me with this. I really needed this. Thanks

Answer 1

[Walter Roberson]

You need to put the value from the VB space into the MATLAB space. See the example http://www.mathworks.com/help/matlab/ref/putworkspacedata.html

[Elvin]

I changed my code to this but I'm getting an error:

Public Class Form1
    Dim Matlab As Object
    Dim a As Integer = 4
    Dim b As Integer = 10
    Dim result As String

      Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

          Matlab = CreateObject("Matlab.Application")
          Matlab.PutWorkspaceData("a", "base", a)
          Matlab.PutWorkspaceData("b", "base", b)
          Matlab.Execute("cd C:\Users\Elvin Gentiles\Desktop\Program")
          result = Matlab.Execute("out = addMe(a,b)")
          result = Matlab.GetVariable("out", "base")
          TextBox1.Text = result
      End Sub
  End Class

Here's the error