xy-graph

[Magnus Strandberg]

Hi....
In a xy-graph I'm plotting two y-values at the same x-value. I'm plotting in points-mode (common plots mode). To keep old points in the graph I'm using a while-loop and shift register to put together new y-and x-values with the old ones.
The data looks like:
1-D array of,
cluster of 2 elements,
1-D array of:
double
1-D array of:
double

The first time I'm obtaining the dots in the xy-graph, everything is fine. The second time (in the while loop) the old dots in y-led suddenly has a line connecting them, while the dots in y-led are ok.
This continues also through the next loop.
Anyone who has an idea to get rid of the lines in y-led

Regards
Magnus Svensson

[Magnus Strandberg]

Hi..

I notice that I left out some words in my Question. The correct line is:
"The second time (in the while loop) the old dots in y-led suddenly has a line connecting them, while the NEW dots in y-led are ok."

[paul_s]

It sounds like you may be using an uninitialised shift register - if you post your code (6.0.2 or less plz) we can take a gander

[paul_s]

on re-reading... it doesnt sound like USR but still need a look...

[Magnus Strandberg]

Ok...
I'm posting a labviewprogram which contains the problem.
I'm using labview v5.1.
/Magnus Svensson

[Dennis_Knutson]

Inside your while loop, you're creating a new plot each time and not appending new data to a single plot. Take just the x and y arrays and append data to them. Do not use the build array with the graph cluster as inputs. I can't save a VI as 5.1 but maybe someone else can post a corrected example.

[Magnus Strandberg]

I've have been trying to use your solution and correcting the program, but I'm afraid I haven't been able to solve it. Could you please post a print screen picture of a correct program? That would be grateful.
Regrads Magnus Svensson

[BrandonS]

I hope I am interpretting what you want to do correctly. Take a look at this code. The way I have coded this you are only drawing two traces, not adding a trace to the plot on every iteration of the inner while loop. I hope this answers your question.

[Dennis_Knutson]

Try something like this or Blimpie Boy's

[Magnus Strandberg]

Yes..thank you...It is working.. 🙂
You manage to make me to understand what I was doing wrong the whole time. Thanks to you all...
Have a very nice day
A happy Magnus Svensson