LabVIEW Idea Exchange

Jim12345678 · ‎10-13-2015

The current strip charts display data a fixed intervals. If I want to plot data that is collected at inconsistent intervals I have to use a XY chart and record the paired data. How about creating a strip chart that displays the data against the time it was added to the plot? The program provides the Y value and the x value is just the time the data was plotted. The plot could have a time constant for the entire window much like the scroll rate used in actual paper chart recorders (e.g. 1 cm/minute). In other words, one could configure the chart to have a span of 1 hour. After an hour, data would get "pushed" off the end etc..

crossrulz · ‎10-13-2015

Actually, if you use Waveforms properly, they will do this for you. I had a project where I got signals at inconsistant intervals. I would just create a waveform from the curent time and the single data point I had at that time and wrote that to the chart. When the next one came in 0.5 seconds later, I did the same thing and the chart used the T0 time to put the data point in the right spot on the chart.

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Jim12345678 · ‎10-14-2015

Can you post example code? I've spent the morning trying to figure out your approach.

crossrulz · ‎10-14-2015

I just made a quick nugget here: Sporatic Waveform Chart

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Jim12345678 · ‎10-14-2015

Now I just have to figure out how to get this to work with multiple plots....

crossrulz · ‎10-14-2015

Looks like something is wrong with your chart. I suggest starting a new thread in the LabVIEW board to figure out this issue.

There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
"Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5

Jim12345678 · ‎10-14-2015

I have to figure out how to make a 2D waveform chart - if that's even possible.

crossrulz · ‎10-14-2015

Sounds like you are using graphs instead of charts. Again, I recommend starting a new thread in the LabVIEW board.

There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
"Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5

donkdonk · ‎10-17-2015

Yes!!! Kudoos.

However it is a duplicate of my idea, see http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Charts-with-quot-non-evenly-spaced-quot-timestamp-per-...

(My headline probably is a not-so-good one. The idea did not catch on )

I am really surprised LabVIEW does not have charts that behave as the suggested idea.

Moreover, I am surprised no one seems to bother!

I even had collegues -unfamiliar with LabVIEW- doubting this NI software could be taken seriously for not having this obvious chart functionality.

There is a workaround though, already pointed out by crossrulz.

AristosQueue (NI) · ‎10-18-2015

I just posted to the other thread why I believe this request to be a bad idea to ever add to LabVIEW. This idea will be closed as a duplicate of that one.

Darren · ‎10-19-2015

Duplicate of http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Charts-with-quot-non-evenly-spaced-quot-timestamp-per-...

LabVIEW Idea Exchange

add a timed strip chart