Complex data polymorphism with functions

Hi Labview forum,
I just came across several bugs in my VIs processing of complex data.
I created the VIs with real data as inputs and outputs. Then later wanted to use them with complex data input.
I think the VI threw away the imaginary components of my data. Can some one confirm this is labview's behaviour?
Now the question is, can I make VIs which recognise whether the input and operational output is real or complex and treat it as such? Or should I set all my data types to be complex unless I know for sure they will be real. The indicator displays don't look so nice when there are a whole series of +0i's.
Regards,
Jamie
Using Labview version 8.0

Jamie,
You are correct in your first statement that LabVIEW "throws away" the imaginary components of your data if you connect a complex data type to a real number indicator (i.e. UINT8, 16, etc). You can tell that a transformation is occuring because a coercion dot appears at the corresponding terminal on the block diagram.
One method to recognize whether or not the input data is complex is to use a case statement to determine if LabVIEW should treat/display the number as complex or real. I have attached a quick sample example that implements this design.
One note with the code within the case statement is that it uses references to the indicators and property nodes to make the correct indicator visible. To see more information on this feature consult the LabVIEW help documentation.
Cheers,
Jonah Paul
Applications Engineer
National Instruments
Jonah Paul
Marketing Manager, Embedded Software
Evaluate the LabVIEW RIO Platform! - ni.com/rioeval
Attachments:
complex_numbers.vi ‏15 KB

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/people/siegfried.szameitat/blog/2005/09/29/generic-extraction-via-function-module
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