Saving current graph data

[glskinner84]

I couldn't find a panel update property node. But it sounds like that would work. Here is my vi.

[James.M]

Do you want a freeze button in there to do the freezing, or you just want it to freeze for a split second when you hit Acquire?

The terminal "Waveform Graph" is what is updating the graph. If you move that terminal to somewhere that isn't receiving data, then the graph won't change.

[glskinner84]

I actually would love to stop the data from going to the graph so I can actually see what I'm about to aquire...For instance: I turn off my signal source...damping occurs. I stop the graph. I aquire what's on the graph. I know I can do this with the export function but I wanted to programatically do this somehow. I need to be able to look at my "frozen data" before I decide to aquire it.

[glskinner84]

There must be a way to save the data left on the graph in an excel file, without having to open excel?

[James.M]

Is the rest of the data still acquiring, or you just want to halt altogether?

[Gregory]

As the others have said, you should make your program in a way that allows you to stop updating the graph without completely exiting your VI. For the record, here is a way to freeze the panel using defer front panel updates.

[altenbach]

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@Gregory wrote:

I have found that the data you export from a graph is not necessarily the raw data that you send to the graph. 

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The main problem is that the formatting of the data is limited to the formatting of the axis markers. For example if you markers are "%.1f" for a pleasing look, the data will only be saved with a precision of 1 decimal digits causing serious quantiziation. (See also this old comment!)

(Here's a picture, sorry for the typos ;))

I typically set the formatting to a fancy format and hide the axis, but that's not always a solution. I think the current save behavior is not useful.

Personally, I would bypass this mechanism and instead just branch the wire going to the graph and do the saving in a custom subVI. No extra indicators needed.

[glskinner84]

I think freezing the graph is the least of my worries now...considering I need to actually view the frozen data before I send it to file. And I could hault aquisition...as long as the data points are still on the graph and are obtainable.

[glskinner84]

Greg, I'm not sure I understand your snippet regarding deferring panel updates.

[Gregory]

You correctly called it a snippet, so I assume you've dragged it to your block diagram to view the code?

Was there a specific question about it?