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% File Name: PlotFilter.m
% Jiwon Seo (jwseo@stanford.edu, jiwons@gmail.com)
% 2/24/2008

function PlotFilter(filterCoeff, H_design, W_design)
close all; % Close all existing figures.

stem(filterCoeff);
xlabel('Sample Number (n)');
ylabel('h(n)');
% If you want to include some "variables" in the title
% or labels, you could use the following trick.
% ('...' just connects two lines.)
title(['Filter Coefficients (Length = ' ...
        int2str(length(filterCoeff)) ')']);

% Make another figure and hold the figure 
% to plot multiple graphs on top of each other.
figure; hold on; 

% 'subplot' is also a good thing to know.
subplot(2,1,1);
plot(W_design / pi, abs(H_design)); 
% In order to include ' in a string, you should
% type it twice!
title('Filter''s Magnitude Response');
ylabel('Magnitude (absolute value)');

subplot(2,1,2);
plot(W_design / pi, AbsTo_dB(abs(H_design))); 
% You can print Greek letter on the screen.
% (eg. \pi)
xlabel('Normalized Frequency (x \pi rad/sample)');
ylabel('Magnitude (dB)');