Waveform chart display repeating

[danielbarnett]

I am having a problem with waveform charts spuriously repeating data.  Hopefully this can be seen from the attached image.  This seems to happen early on in a run of the VI, as the buffer fills up, the number of repeats reduces, and eventually behaves as I'd expect.

Has anybody any idea what might be causing this, or any routes that might be worth exploring?

[Eugen_Graf]

You have to scale right your X-Axis.

[danielbarnett]

How exactly?  I get the same behaviour whether the chart is set to autoscale x or not, and I can't see any other options that might account for this.

[Dennis_Knutson]

A chart or graph will only display data that has been written to it. If you are getting data repeated, you probably have a problem in how you are updating the chart with new data. ARe you using a shift register anyplace to hold the data? Where is the data coming from? Why don't you post the VI or at the very least, an image of the block diagram?

[danielbarnett]

Thanks, that's fixed it.  I was feeding the graph a 2D array which was being updated with a shift register.  I think I was confusing it with a XY graph, so thanks again.

Daniel