Hi Guys, I have spent a day or two trying to figure this out... I have a waveform graph with 64000 data points over a period of 1 second (64kHz). I am then attempting to get a sample from this waveform at 128kHz. So from my understanding that means from a specfic time value (on the X Axis) I need something that will return the corresponding Y Axis Value. Interpolation may be needed as the value on the X Axis may not exist in the WaveForm array. Does anyone have any idea how to go about this? Cheers, Alex

AlexC1231 wrote: altenbach - "So, you want to get a single Y point from a potentially fractional array index of the waveform data" That is correct yes. Well, then you don't need to generate the entire interpolated waveform, all you need is extract a single point. Interpolate array will do that for you. For 1D array inputs, you wire the fractional index (which in your case would have a .5 as fractional part, easily calculated from your time values). However, you can also wire an array of points (cluster of x, y) and it will do the rest for you. 😉 Attached is a simple example.

LabVIEW

Get X Data from Y (t0) Waveform Graph

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That is amazing, thank you very much for your help altenbach and everyone else who provided their assistance!

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LabVIEW

Get X Data from Y (t0) Waveform Graph

Re: Get X Data from Y (t0) Waveform Graph