Help: Array Double != Array Double ....Why ?

[ZeroREA]

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

[Derek Stone]

For i = 1 To 100

Arrays are zero-based. I'm sure that's one of your problems.

[ZeroREA]

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)