topic Re: XY graph multiplot in LabVIEW

XY graph multiplot

BENTATA — Thu, 30 May 2019 14:11:17 GMT

Hello,

I want to plot a multi measurement in the same plot XY graph, but when I click to remeasure its plot the new measurement in the same plot. So, its connect the last value of the previous measurement with the first value of the next measurement i.e its doesn't create a new array but its just append the new values to the previous array. how can i create a new array on each call or just delete the line between this two values.

Thanks

Re: XY graph multiplot

PsyenceFact — Thu, 30 May 2019 14:57:32 GMT

What format is your data in? If you are using an array of XY pairs, they need to be combined for the graph using Build Cluster Array.

Re: XY graph multiplot

BENTATA — Thu, 30 May 2019 15:29:43 GMT

Actually I tried this build array cluster.

I attached my VI.

Re: XY graph multiplot

JScherer — Thu, 30 May 2019 15:54:34 GMT

Depending on how your data is stored one of these two methods may be better:

Re: XY graph multiplot

JScherer — Thu, 30 May 2019 16:05:27 GMT

@BENTATA wrote:

Actually I tried this build array cluster.

I attached my VI.

Remember that when you just send your VI, we don't get your entire hierarchy (type defs, sub VI's, ect)
Here's a link that talks about using projects to better transfer your work.

A few notes:

1) These solutions are used in place of the "Build XY graph," express VI's

2) You may want separate your states a little more a common cycle is:
Initialize Instruments -> Configure -> Read Data -> Display Data -> Read Data ... ->Save -> Disconnect Instruments -> Exit

Re: XY graph multiplot

BENTATA — Fri, 31 May 2019 08:47:17 GMT

But in my states I need to recycle without deleting the previous data and to plot my new data in the same graph.

@JScherer wrote:

@BENTATA wrote:

Actually I tried this build array cluster.

I attached my VI.

Remember that when you just send your VI, we don't get your entire hierarchy (type defs, sub VI's, ect)
Here's a link that talks about using projects to better transfer your work.

A few notes:

1) These solutions are used in place of the "Build XY graph," express VI's

2) You may want separate your states a little more a common cycle is:
Initialize Instruments -> Configure -> Read Data -> Display Data -> Read Data ... ->Save -> Disconnect Instruments -> Exit

Re: XY graph multiplot

PsyenceFact — Fri, 31 May 2019 09:19:54 GMT

@BENTATA wrote:

But in my states I need to recycle without deleting the previous data and to plot my new data in the same graph.

You can do this using property nodes. Here's an example.

You can use the reference to the XY graph control to do this in a subVI if it suits your code structure (I couldn't look at your VI as I only have LV2015).

Andy

Re: XY graph multiplot

BENTATA — Fri, 31 May 2019 11:35:42 GMT

@PsyenceFact wrote:

@BENTATA wrote:

But in my states I need to recycle without deleting the previous data and to plot my new data in the same graph.

You can do this using property nodes. Here's an example.

You can use the reference to the XY graph control to do this in a subVI if it suits your code structure (I couldn't look at your VI as I only have LV2015).

Andy

Thanks very much for your help, Could you please tell me how to make my data output as yours (from a 2D array to a cluster of two elemets). I tried convert array to cluster but it doesnt work.

Re: XY graph multiplot

PsyenceFact — Fri, 31 May 2019 12:24:49 GMT

@BENTATA wrote:
Thanks very much for your help, Could you please tell me how to make my data output as yours (from a 2D array to a cluster of two elemets). I tried convert array to cluster but it doesnt work.

Array To Cluster only operates on a 1D array. You need to use Index Array to get the two rows of your 2D array (presumably containing X and Y data) then Bundle to create the cluster. This can then be turned in to an array.

Re: XY graph multiplot

BENTATA — Fri, 31 May 2019 14:40:46 GMT

Thank you for your help, I tried to connect the read value + the new data in the write value as you did but it didnt work.

Re: XY graph multiplot

altenbach — Sun, 02 Jun 2019 02:05:32 GMT

@BENTATA wrote:

Thank you for your help, I tried to connect the read value + the new data in the write value as you did but it didnt work.

You need to configure the built array to "concatenate mode". Still, the value property node suggestion is absolutely horrible. Don't do it!

I'll try to make a better example later...

Re: XY graph multiplot

altenbach — Sun, 02 Jun 2019 02:32:42 GMT

OK, first of all, you need to show us your code, because there are many ways to do multiple measurements. We also don't know your LabVIEW version.

The solution is always the same: Keep the current plots in a shift register and append the new plot, then update the graph. Here's one possibility:

OTOH, of you want to append to the same plot, but just create a gap, include a NaN values between plots.

Re: XY graph multiplot

altenbach — Sun, 02 Jun 2019 02:39:26 GMT

@altenbach wrote:

OTOH, of you want to append to the same plot, but just create a gap, include a NaN values between plots.

Here's how that could look like: