Question
I perform the following code for a low pass filter and the response shown in FVTOOL displays a large range for the filter. [a b] = butter(2, 0.01, 'low'); fvtool(a, b); However, when I use FVTOOL for a high pass filter, the range in the y-axis is much shorter. [a b] = butter(2, 0.1, 'high'); fvtool(a, b);
Expert Answer
Neeta Dsouza
PhD Expert
Answered Aug 30, 2026
FVTool auto-scales graphs and forces tighter limits for filters based on their shape. You can use any one of the following workarounds to see the full plot:
1. Click on the View menu option and select 'Full View'.
2. Manually setting the axis to have a larger range.
3. Use the following code to automatically display a larger range for the filter:
[a b] = butter(2, 0.1, 'high'); [h,w]=freqz(a,b); h=10*log(abs(h)); w=w/max(w); plot(w,h);
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