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Posted

First forgive me if this is not a syntax related problem, but I think it is to special for the General forum and may be related to a syntax or whatever problem.

 

I have a problem with VB (.NET) arrays and I really do NOT understand it....

 

I construct an array and give it to a function (Matlab DLL). However the problem is NOT the Matlab DLL !

 

This works:

 

Dim data1 As Double()

data1 = New Double(3) {}

data1(1) = 4

data1(2) = 7.5

data1(3) = 2.3

 

 

This give me an absolute crash in my function Code since it seems to be different:

 

Dim myDataArray1() As Double

myDataArray1 = New Double() {}

Dim myDataArray2() As Double

myDataArray2 = New Double() {}

Dim myDataArray3() As Double

myDataArray3 = New Double() {}

 

ReDim myDataArray1 (100)

ReDim myDataArray2 (100)

ReDim myDataArray3 (100)

 

 

For i = 1 To 100

myDataArray1 (i) = i

myDataArray2 (i) = i / 2

myDataArray3 (i) = i / 4

Next i

 

 

Both are Double Arrays, so what is the difference between them ???

 

My Matlab-Function needs an array of double like data1(1) = 4 , but this is not very dynamicly...

 

Example for my function:

 

Call myChaosLibrary.poincareplot(myDataArray1, myDataArray2, myDataArray3,....)

 

If I do this:

 

Dim myDataArray1 As Double()

myDataArray1 = New Double(3) {}

myDataArray1 (1) = 4

...

 

and call the function above everything works fine !

 

But: If I use the other method for dynamic data content the array differs within the DLL... It does not crash really: the content of the arrays differ and produce a wrong result within the DLL. Funny: it seems that witin the DLL we get some kind of myDataArray1 = myDataArray2 = myDataArray3

 

This is definitly a problem from the VB side and not from Matlab since the Matlab script works fine itself and it works with the "myDataArray1 (1) = 4 " assignement.

 

 

I really appreciate any help

Posted
Strange, but after recompiling the Matlab scripts (this time with debug information) it seems to run. Very strange. Anyway thanks for your fast help try (the i=1 was not the problem)

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