Coherence averaging without while loop

Hi all,
I attached a VI (Coherence.vi using LabVIEW 2011) that calculates and plots the coherence for two simulated signals. It works fine but I want to make a change that I don't know how to manage.
I want to elimnate the while loop (as I am planning to convert this VI into dll and use it in JAVA appilcation) and do the averaging in an alternative way without using while or for loop.
The problem with the while/for loop is that the dll doesn't give any output except if the while/for loop is stopped.
Is there any ideas?
Attachments:
Coherence.vi ‏24 KB

Hi Cowboy12,
From what I understand, it looks like the averaging VI in your code uses uninitialized shift registers to store previous data, similar to functional global variables.  It seems that each time you are calling this VI from java the result exits out of LabVIEW memory after executing.  This means that each time you call the VI from java you are getting a new instance of it with no memory of the previously averaged signal.
I think your best bet is to keep the while loop in LabVIEW, so that the current averaging VI works appropriately.  If you really must remove the while loop, then you could write your own version of the averaging VI that takes in the last averaged signal and feeds it into the currently uninitialized shift register.  You would then also need some way of storing this averaged signal in Java and then sending it back into LabVIEW the next time you call the VI.  However, this seems like a very complicated way to obtain the result you want.
Hope this helps!
Lindsey W. | Applications Engineer | National Instruments

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