v_c said:To the best of my knowledge, FIR and IIR filters always refer to digital filters. I have never seen them used for s-domain filters. FIR have all zeros sometimes referred to as MA (moving average) and IIR have both poles and zeros sometimes referred to as ARMA (auto-regressive moving average). Am I wrong in these definitions?
Check out this h**p://www.mathworks.com/access/helpdesk/help/toolbox/signal/fir1.html to see how FIR filters are implemented in Matlab.