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16 Chapter 1 INTRODUCTION
1
Stem Plot of sin(0.2 π n)
0.5
x(n)
0
–0.5
FIGURE 1.2
–1
0 5 10 15 20 25 30 35 40
n
Plot of the sin(0.2π n) sequence
displays graphs in Figures 1.1 and 1.2 as one plot, depicting a “sampling”
operation that we will study later.
>> plot(t,xt,’b’); hold on; % Create plot with blue line
>> Hs = stem(n*0.05,xn,’b’,’filled’); % Stem-plot with handle Hs
>> set(Hs,’markersize’,4); hold off; % Change circle size
Another approach is to use the subplot command, which displays
several graphs in each individual set of axes arranged in a grid, using the
parameters in the subplot command. The following fragment (Figure 1.4)
displays graphs in Figure 1.1 and 1.2 as two separate plots in two rows.
. . .
>> subplot(2,1,1); % Two rows, one column, first plot
>> plot(t,x,’b’); % Create plot with blue line
. . .
>> subplot(2,1,2); % Two rows, one column, second plot
>> Hs = stem(n,x,’b’,’filled’); % Stem-plot with handle Hs
. . .
1
Plot of sin(2π t) and its samples
x(t) and x(n)
0.5
0
–0.5
FIGURE 1.3
–1
0 0.5 1 1.5 2
t in sec
Simultaneous plots of x(t) and x(n)
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