Why am I unable to get data from MATLAB into my VBA application?

I am passing a 1-dimensional Variant array from Excel VBA to MATLAB using the PutWorkspaceData function. This works as expected. However, when I try to read this array back from MATLAB into Excel using the GetWorkspaceData function, I get an error.

Answer 1

[MathWorks Support Team]

When working with data brought in from MATLAB over the COM interface, we need to know the expected dimensions of this object. For instance, in the example below, we need to know that the fromArray returned by MATLAB is a 2x2 matrix:

Sub mytry()
Dim ml As Object
Dim toArray, fromArray As Variant
Dim simple(1, 1) As Double

Set ml = CreateObject("matlab.application")

simple(0, 0) = 1
simple(0, 1) = 2
simple(1, 0) = 3
simple(1, 1) = 4
toArray = simple

Call ml.PutWorkspaceData("toArray", "base", toArray)
Call ml.GetWorkspaceData("toArray", "base", fromArray)

MsgBox fromArray(0, 0) & " " & fromArray(0, 1) & vbCrLf & fromArray(1, 0) & " " & fromArray(1, 1)
End Sub