Filter an analog input

[aflores]

I have an analog input, and on this part of the signal processing, I have to rectify, filter and decimate it after recording. The problem is that I can´t filter (Lowpass, butterworth, cut frecuency of 3 Hz, order 2) because the arrays are of different dimensions, my signal dimension is 2 and the filter dimension is 1. What can I do?

[tbob]

What are the two columns in your 2D array? One should be actual digitized numeric values of the signal samples. This is what the filter programs are made to take as an input. Could you split your 2D array into two 1D arrays and send the one with signal values into the filter?

[JFT']

I think you want something like this...
See the attach file.

Hope this help,

JFT