appending arrays in FOR loop

[phabib]

I'm very new to Labview and trying to get some code working.  I have some data that I'm reading 128 bytes at a time in a FOR loop.  I would like to build up that data so that at the end of the loop I have an array of 1024 elements.  I have tried using build array with concatenate turned on and a single input but it just results in the data in my destination array being overwritten each time the loop executes. 

Is there a VI that does what I want directly, or what is a way to get what I'm after?

Thank you.

[Darin.K]

I am guessing that a shift register is the missing element in your attempt, although I often use the reshape array route myself. 

[smercurio_fc]

Or...

 

Message Edited by smercurio_fc on 10-24-2009 08:49 PM

[phabib]

Thank you.  I was missing the shift register.  Being a C programmer, I expected the array to persist in my loop.  I did not realize I had to do something special to save the value and re-introduce it for the start of each iteration.

[Ben]

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phabib wrote:
Thank you.  I was missing the shift register.  Being a C programmer, I expected the array to persist in my loop.  I did not realize I had to do something special to save the value and re-introduce it for the start of each iteration.

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Good! 

There are many subtle things that look what we knew from C but are diferenent. Yes a static local is like Shift Register IF it is not initialized.

Please read (when you have some time) this Nugget on a code structure we often use in LabVIEW (called an Action Engine) to share data across multiple threads without having to go to explicitly using mutexes.

The other thing I should make sure you hear early on is "controls/indicators" and locals are NOT like locals in C. In LV the wires are un-labeled variables.

Ben