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I need to merge a few data sets together, they were taken from different DAQ systems, and have different time stamps (sampling rates) associated with them. So, I'd like to put them all together in one file, but have the data points all spaced out correctly (just padding the data on the slower sample rate data). Does LabVIEW have any tools for merging data like this?
LV doesn't have a complete tool for doing this sort of resampling, but it does provide all the functions necessary to build one. The two functions you will need are the ones for threshold (to calculate a fractional index of a point), and then interpolate (to calculate a new data value associated with that fractional index).
The basic process is called resampling a signal.
Mike...
Certified Professional Instructor Certified LabVIEW Architect LabVIEW Champion
Actually, LabVIEW has several tools for resampling full waveforms. Do a search for "resample" in the palettes. I got three Express VIs and seven normal VIs (your mileage my vary depending upon what you have installed). Use the one which best fits your needs. You need to do three things:
Change the sample period so that it is the same for all waveforms (use the smaller period of your data sets)
Shift the timestamps so that the points all line up (this is a subsample shift in time, resample will do this, as well)
Pad the ends of waveforms so they are all the same length. You can do this with build array or the waveform utilities.
