How can I call a Matlab script from VB.net?

Question

I've written a Matlab script which it calls several functions within itself, and now I need to run it from VB.net. The Matlab script has no input from VB, but it has an image output and a number from the workspace. After watching this youtube video, and reading this page, I wrote the following code within VB.net: (In this code main.m is the name of Matlab script)

Public Class Form1
    Dim MatLab As Object
    Dim Result As String
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        MatLab = CreateObject("Matlab.Application")
        Result = MatLab.Execute("cd D:\\main.m\")

    End Sub
End Class

Also, I tried to use these pages (link 1, link 2), but they returned errors.

Visual Vincent · Accepted Answer · 2019-07-29 13:26:23Z

2

cd stands for Change Directory. If you call cd D:\main.m\ you're trying to navigate to a directory called main.m (which does not exist).

You have to do this in two steps: Change the directory first, then execute the file.

'Change directory to "D:\".
Result = MatLab.Execute("cd D:\")

'Execute "main.m".
Result = MatLab.Execute("main")

edited Jul 29, 2019 at 13:26

answered Jul 29, 2019 at 13:19

Visual Vincent

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5 Comments

Yasina Over a year ago

Dear @VisualVincent. It works (It plots the figure).Thanks a lot. How should I get other resulting outputs (I mean the numbers)?

Visual Vincent Over a year ago

@Yasina : Unfortunately I don't know much about MatLab, but you should be able to save it to an image file by executing the command saveas(gcf,'filename.png') (ref: how to save the content of the current figure as an image?). You can then load that image from VB.NET.

Visual Vincent Over a year ago

@Yasina : Sorry, didn't notice that you edited your comment until now. As I said before I know too little about MatLab to be able to help you directly, but from a bit of searching I managed to find the following, which may or may not help you: How do I extract data from MATLAB figures? and: How do I extract data points from a plot?

Yasina Over a year ago

Thanks. I decided to save figure and variable in the database within Matlab, and it's enough. Thanks again.

Visual Vincent Over a year ago

@Yasina : Glad to hear. Good luck with your project!

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