Create waveform from a set of points with differtent time intervals

[Risotto]

Hello,

I would like to create a waveform from a set of points like this

Time           Data

0                 0

0,5              1

0,6              2

1                 1

2                 0

5                 1

.....

The problem is that the time interval between each points are not the same.

The only idea I found was to create a waveform for each doublet of points with the same rate (100ms) and than to append them together.

Does anybody have a better idea?

Regards,

Risotto.

[devchander]

Risotto,

XY charts are for such kind of waveform display.

got to Find Examples in LabVIEW and you will find a vi called xy graph. vi.

just take on array of time( x axis), an an array of data(y axis), bundle them and feed tem to xy graph

this should be of help to you.

[devchander]

see attached pic

[Risotto]

Hello,

Yes, this is good. But how can I create with this curve a waveform with a rate of 1Hz for example?

Regards,
Risotto

[devchander]

sorry Risotto, i misintepreted your query!

i am trying to come up with a possible way.

In meanwhile, let's hope others come up with a good approach

[unclebump]

You need to resample your unevenly spaced data.

Try here.

http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3D93356A4E034080020E74861

Message Edited by unclebump on 09-15-2006 10:35 AM

[Ben]

If you use a Wave From data type, re-sampling is not required.

When using a WF datatype the chart (graph) will pick-up the X value from the t0 of the waveform.

The trick is to just build an array of the single update value and make sure the t0 value is correct.

Re-create this example

and try it for yourself.

Ben

Note: make sure the data you pass is consistant with the data already displayed. If you post a t0 value that is older than what is already displayed, the chart will clear the display and start over.

Message Edited by Ben on 09-15-2006 11:49 AM