rotate flip feedback node

[tdtran]

Hi

I have a simple task I want to do but can't find out how to do it.  I want to flip the direction of the 'feedback node' in a block diagram (from === >  to  < === ).  I know it can be done since I've seen a picture of it.  Does anyone know how, and can you flip other objects in general?

Thank you

tdtran

[mfitzsimons]

How does a flipped feedback node work?  Anti-feedback?  The feedback node gives you the previous iteration so what would a flipped on do?

Sorry, I don't understand what a flipped one would do so if you could clarify then i could try to provide a solution.

Matt

[M_Peeker]

The direction of the arrow, and hence position of in/out data, seems to depend on where in your diagram you put your feedback node. The behaviour seems rather arbitrary to me, can't understand how it's meant to work unfortunately.

LV7.1

[mfitzsimons]

From you picture of the feedback node I would say it has the same function and the direction of the arrow is meaningless.  I personally would use Shift Registers.

Matt

[M_Peeker]

Matt, you're right, it is just a question of diagram layout and preferences. However there seems to be a slight difference in performance between the two according to a previous discussion ( http://forums.ni.com/ni/board/message?board.id=170&message.id=87252&query.id=42897#M87252 ), allthough I don't get the same results when I do a quick check (I get 1-2% difference in execution time, 7.1 on Win2k)

[Norbert_B]

The direction of the arrow of the feedback node decides if the feedback is given "before" or "after" the operation. just implement the node within a function which adds a constant to the last result. you will see the difference, i am sure

Norbert B.

[tdtran]

Actually I was just trying to do what the M_Peeker showed in Feedback node.jpg.  I assume that you could get the

arrow to change direction by moving it about the block diagram?  I'll give it a few more tries.

thx

tdtran.

[Norbert_B]

Hi again,

well, i tried it out for myself changing the direction of the arrow in LV 8.0 and must confess that i didnt manage that. So it seems that this feature has been removed from LV for Version 8.0 (in 7.x just moving around the feedbacknode in a feedbackloop turned it). Poor thing that i havent found a word of that in the documentation of LV...

Norbert B.

[tdtran]

Hi,

Well I worked out how to do it! You can't seem to change the direction of the arrow once it was created.  What I had to do was first arrange the items the way I want them, without the feedback arrow.  Then you right click on the left to right data path and add a feedback arrow from the menu that appears.  The feedback arrow should point from left to right.

TriDat.

[ndo]

This is a late response, but I hope some one will benefit from it.  Dragging the arrow next to the initializer terminal so that they "touch" seems to toggle the direction the arrow points.

LV8.2