filtering/downsampling or smoothing a 3D array

[BPBP]

Hello,

I have attached a VI whereby it accepts a text file with 3 columns of data. Attached is a sample text file.

I could plot out the waveform of the 3 plots, however i would like to do some high pass filtering before displaying it. If i wish to have a 2nd order highpass filter (fc=0.5). I've found the express filter vi but vi becomes broken once i attach it. I think its something to do with the array size mismatch

And i would also like to downsample the data as well prior to filtering as there are too many data(~5000 rows). Ideally i would want to have I could either have 1 row for every 2 rows of 3 column data. or 1 out of 3 rows. How do i do this?

Thanks,

BP

[KateB · Accepted solution]

1. Use Index Array to separate data from each column.

2. Input data from each column to Y of Build Waveform. Don't forget to input dt (time between samples).

2. Use build array to merge waveform together, and input to filter function.