Wavechart not displaying properly

[Dailydon]

I have an instrument that gives me position data in three dimensions which can all be displayed on a wavechart. However, when I try to calculate velocity by subtracting the previous position from a feedback node and dividing by the estimated clock time I get a weird static effect and only one input shows in the wavechart. If I separate the velocity array into one data point the wavechart is able to display the velocity correctly.

Does anyone know why the wavechart is doing this? 

Setup and Result if I output all Velocities:

Setup and result if I output only one velocity:

[GerdW]

Hi Don,

---

@Dailydon wrote:

Does anyone know why the wavechart is doing this?

---

It's not the chart, it's your calculation…

What is shown in your "Position difference" indicator?

Why don't you attach real code? We cannot debug/edit images in LabVIEW!

Suggestion: You should initialize all shift registers/feedback nodes!

[altenbach · Accepted solution]

Yes, please attach a simplified VI, not useless pictures..

Be aware that charting a 1D array with three points will create one plot with three new points per iteration. To update as three plots instead, you can either convert the 1D array to a cluster with three elements (you are already doing that with the "position chart", so duplicate that!) or built it into a 2D array transposed into an array with three rows and one column.

[Dailydon]

Didn't catch that. Thanks for the help. Sorry about the image. I thought dragging and dropping the diagram over to web browser would let me upload that specific code like how LAVA allows you to drag the block diagram off the forum.

[AeroSoul]

You need to create a snippet for that to work.

Select part of code you wish to send, then click Edit-->Create VI Snippet from Selection.

This will create a PNG image that can be dropped on block diagram to recreate your code and is what's often used to share code on this forum.