How to get y axis value(in a numeric control) by providing x-axis value using wave graph

[haimo]

Hi,

I'm new here, Sorry if i have selected wrong Location.

I want to get Y-axis value (in a numeric Control) by providing X-axis Value using Wave graph.

i want to do calculations with the obtained value.

i have attached File and Snapshot.

[akovaski]

You can use the 'Extract Portion of Signal' Express VI to select one sample starting at your selected time. But it's also possible to do it without the Express VI by getting the raw components of the signal.

Both of these solutions are shown in the attached VI.

[Bob_Schor]

Well, you are using the Dynamic Data Type, which I almost never use, but if you convert the data to a WaveForm (using From DDT on the Signal Manipulation Palette, which is a choice when you right-click on the DDT Wire), you should be able to do this.  Do you know about how Waveforms are stored?  They are a Cluster, with t0 being a TimeStamp for the start of the Waveform, dt being the time step, and Y being the samples.  So if you want a point at 0.5 seconds and dt is 0.001, you would pull out the point at Index 499 (offset 0) from the Y array.

Bob Schor

[haimo]

Thanks

[haimo]

Can you please attach .vi file

Bob Schor