Why does GetFullMatrix not work when MATLAB is invoked as an Automation server from my Visual Basic .NET application?

Why does GetFullMatrix not work when MATLAB is invoked as an Automation server from my Visual Basic .NET application?

I am invoking MATLAB as an Automation server from my Visual Basic .NET application using the COM/ActiveX support feature of MATLAB. I can send data from VB .NET to MATLAB successfully using PutFullMatrix function. However, if I try to receive data using GetFullMatrix function, I receive only zeros even though MATLAB has valid data for the variable.

GetFullMatrix works only if I have the following code in my VB .NET application:

OPTION Strict OFF

I would like to have GetFullMatrix work with OPTION Strict set to ON.

The problem appears to be only specific to GetFullMatrix function.

Answer 1

[MathWorks Support Team]

This has been verified as a bug in MATLAB 6.5 (R13) in the way that the COM Interface handles the GetFullMatrix function.

Currently, to work around this issue, try the following:

1. Start a new VB.NET Windows application.

2. Add a reference to the MATLAB type library (whichever is installed on your system)

3. Add a button in the form.

4. At the top of Form1.vb file you can add, Option Strict On.

5. Double click at the button in the form and add following code to Button_Click:

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

         Dim mat As MLApp.MLAppClass

         mat = New MLApp.MLAppClass()

         Dim pr() As Double = {10, 11, 12, 13}

         Dim pi() As Double = {1, 2, 3, 4}

         mat.PutFullMatrix("a", "base", pr, pi)

         Dim prResult As Array = Array.CreateInstance(GetType(Double), 4)

         Dim piResult As Array = Array.CreateInstance(GetType(Double), 4)

         mat.GetFullMatrix("a", "base", prResult, piResult)

     End Sub

The values can be seen in prResult and piResult.