LabVIEW
Multiple plot XY graph
Hello,
I am facing a problem with displaying multiple plots on a single XY graph.
I use Build Array to build array of two 1d arrays of clusters with X and Y values.
Unfortunately, the effect is that I can see both plots, but they are realy single plot (the same colour, etc.).
DADES_CORVA is empty, so the only thing that we sould see is plot 0,0 to 50,50. As you can see below it is the same colours as Plot 0, also when I hide Plot 0 it disappears.
Where is the problem? In my opinion it should be Plot 1 with thick green line.
Thank you for your support.
Hi Pawel,
your cluster array wire holds an array of cluster of XY point.
First mistake: each plot should consist of a cluster of an X array and a Y array (as is shown in the help of the XY graph!)
Second mistake: your BuildArray node is set to concatenate the inputs, instead of building up an array. This way you still have just one plot in the array…
3rd mistake: When you want to show a plot, which consists of just one point you should change the plot properties to also show points…
Hi Pawel,
is it possible to add second plot generated correctly
No, the XY graph does NOT accept a 2D array of points.
not messing with the rest of the code?
You can create your own "glue code" to convert the array of points to cluster of X/Y array. Then create an array of cluster of X/Y array to have more than one plot in your graph:
Hello GerdW,
When I try to do this with just one plot, there is error as below - it looks like graph demands 1d array of cluster, not cluster of 2 arrays.
BR
Hi Pawel,
that's just because your abuse of local variables!
Get rid of the local variable (of the graph) and the problem is gone too!
Background: the graph terminal will adapt to several datatypes as can be seen in my image above. The local variable will only support the datatype that is currently wired to the terminal - and CANNOT adapt to other datatypes…
@PawelS wrote:
Hello GerdW,
When I try to do this with just one plot, there is error as below - it looks like graph demands 1d array of cluster, not cluster of 2 arrays.
BR
Please attach your actual code. We cannot debug pictures (for example what is in the array constant you are using to initialize the shift register? What are the dimensions of the various arrays?
Your array operations are overly complicated for such a simple task. To get rows or columns, use "index array". Instead of "inerset into array" use "built array". "Index array" is resizable and you don't need to wire the indices if you want the elements in order. You can combine the of.c.input/if_ini and of.c.out/of_ini scalars first so you only need one array operation.
You don't need a shift register at all. I would recommend to use complex data for xy graphs.
Where is the local variable data coming from?
Please attach your VI containing typical data in the various controls/indicators. Thanks!
Thanks for the tip about complex data, Altenbach, I did not know you could do that before. When putting multiple plots on the same graph, is the following example the correct way to do it? It seems odd to bundle the data into a cluster by itself, but it works.
