Why does the BUTTER function return different results for Signal Processing Toolbox versions 4.3 (R11.1) and 5.0 (R12) on my PC?
For example:
samplingrate=500;lowend=.1;highend=10;Wn=[lowend highend]/(samplingrate/2);[b a]=butter(8,Wn);
The value of the zeros vector 'b' returned by the BUTTER function is different for R11.1 and R12. I am confused as to which answer is correct.
Best Answer