Parameters to SubVIs: reference or copy?

[professor_rumsdiegeige]

Hi,

I've got a very large 2D array that is passed to a subVI, which is called frequently.

My question is: is this big array copied each time, or is it passed as a reference (like a pointer in C) ?

Thanks a lot.

Sabine Lorentz

[Grampa_of_Oliva_n_Eden]

Please see the "Clear as mud" posting in this thread by Greg McKaskle on the DarkSide.

Ben

[Cat]

QUOTE (neBulus @ May 19 2009, 10:20 AM)

Please see the http://forums.ni.com/ni/board/message?board.id=170&view=by_date_ascending&message.id=191864#M191864' target="_blank">"Clear as mud" posting in this thread by Greg McKaskle on the DarkSide.

Thanks for the link, Ben.

I've been realizing from bits and pieces I've been picking up on LAVA that it matters where controls/indicators live. Intuitively, it's always seemed to me that I should put data (control) only in the case where it's going to be read. Greg's comment that: "the subVI can truly be inplace only if its terminal is owned by the top diagram and not placed into a loop, sequence, or case diagram" changes that paradigm. I'd never considered there might be different "layers" to a single block diagram. I'll need to look over some code (especially with large data sets) and see if I need to move some controls.

Cat