butterworth low pass filter

This is the firt time to learn program in matlab. And now I get a problem . I want to design a IIR butterworth low pass filter, order 10 and cutoff frequency pi/2. How should I start the problem or what kind of function shoud I use .

Can anyone give me some suggestions ? Thanks very much!

Answer 1

[Wayne King]

Have you read the reference page for butter.m?

[B,A] = butter(10,1/2);
% Visualize filter
fvtool(B,A)

[Qifei]

not yet .. where is it? could you please give me the link? thanks for your advice .

[Wayne King]

>>doc butter

[Walter Roberson]

http://www.mathworks.com/help/toolbox/signal/ref/butter.html

Answer 2

[Megavarshini]

give fully