This is an issue that comes up every once in a while, most reacently here in the Idea Exchange. So I figured it was time for a nugget. Ok, so we have data that comes in at a non-constant rate (ie, the time between samples is non-deterministic). But we want to show this data in a chart. I have heard of people creating code to build up XY graphs based on the time stamp and keep building up the arrays to do the job. But the chart can already do it all for you! All we do here is create a waveform from our data sample and the current time. We then write that waveform directly to the chart. The display of the chart will use the value in the T0 of the waveform to know where to put the first data point in the waveform. Attached code is in LabVIEW 2015.

LabVIEW

Nugget: Sporatic Waveform Chart

@Ben,

[..]you are working with Y arrays larger than a single element[..]

Thanks for the note!

However, now I am a bit confused. I am not working with Y arrays larger than a single element. I am working with multiple Y arrays with a single element, but these multiple Y arrays (representing multiple channels) are plotted at a single time stamp t1. The next while loop iteration again generates multiple Y arrays with a single element, and these also are plotted at a single time stamp, but now at t2.

Just to know precisely what you mean I will describe what I'd like to do.

I would like to use it as in your example (except that the loop time will vary). The first for loop represens the acquired data, here two data points simulating 2 channels and stored in a 1-dim array. The second loop with the build waveform primitive will always have an Y array with only one element, but -like your example- written sequentially with identical time stamps. May this cause problems? Because as it is now, in LabVIEW 2013 it works.