XY graph multiplot

[Joycezh]

Hi,

I have some questions about XY graph. Please kindly see the block diagram attached.

Basically, at each iteration, the program will generate one set of X-Y data and I wanted to plot all sets of X-Y data inside one graph. If I plot the function 'X-Y' graph inside the for loop, it will only show one plot, but if I put the 'X-Y' graph outside the graph, it will show all the plots at a time at the end. Is there a way that it will show plot one by one?

the second quesions is I want to show the plot legend as the applied bias, How can I control the plot legend? I am using Labview 2010. I right clicked the X-Y graph, then go to Create--> property node, I didn't see a property of plot legend.

Thanks,

Joyce

[james88]

Hi Joycezh

Yes you can, try using shift registers to keep the data and plot it again, here is an example that you can find in this link.

https://decibel.ni.com/content/docs/DOC-16243

Propery->legend->plots shown , here you can define how many plot do you want to show.

Regards

[james88]

Hi Joycezh

If you cant find that property node explained in this link http://zone.ni.com/reference/en-XX/help/371653B-01/lvprop/wfmgrph_lgndplots_shwn/

, try with LegNumRows with the LegVis property Node enable

Regards

[altenbach]

All you need is drop the xy graph from the express palette. It includes the build xy graph express VI. To retain a history, configure it to retain data between calls.

You can configure all graph properties via property nodes (axis: xo, dx, axis label, etc; plot: label, etc.). This needs to be done only once, of course and not over and over in a loop. To change the plot legend, select property "plot...plot name"

Please attach your VI to make it easier to show the best modifications.

[Joycezh]

I changed my program to this, however, it can only show 2 curves, why?

Thanks,

Joyce

[Joycezh]

Hi, Altenbach,

Here is my VI. I am still lost on how to retain a history...

Thanks,

Joyce

[altenbach]

You need to put the array of accumulated plots into the shift register, not only the new plot.

Here's a quick revision (Also the legend property needs to be set only once before the loop).

[Joycezh]

Thanks, Altenbach, now it shows all the plots in the graph.

However, the legend is not correct, please see the attached. The legend "-0.70000' is actaully the name for the last plot (the blue curve).

Thanks,

Joyce

[altenbach · Accepted solution]

property nodes execute to to bottom. You need to set the active plot before setting the legend. See attached.

[Joycezh]

Thanks a lot! It works!

Joyce