Time Domain Representation of Continuous and Discrete Signals
33
ylabel( ‘f2(t)’)
axis([0 4*pi -2.5 2.5])
grid on;
title(‘2*Square(t,25) vs t’)
subplot(2,2,3)
plot(t,f3)
axis([0 4*pi -4.5 4.5])
grid on;
ylabel(‘ f3(t) ‘);xlabel(‘ t (time)’)
title(‘3*Square(t,33) vs t’)
subplot(2,2,4)
plot(t,f4)
axis([0 4*pi -5.5 5.5])
grid on;
title(‘4*Square(t,75) vs t’)
ylabel(‘ f4(t) ‘);xlabel(‘ t (time) ’)
The script fi le squares is executed and the results are shown in Figure 1.30.
R.1.107 The MATLAB command sawtooth(t, b) returns a triangular wave, with magnitudes between −1 and +1, and a period of T = 2π. The scalar b, between 0 and
1, indicates the percent of the period T with positive slope, where the maximum
occurs at the end.
Square(t,50) versus t
3*Square(t,33) versus t
4*Square(t,75) versus t
2*Square(t,25) versus t
1.5
2
0
−1
−2
0
5
10
1
1
0.5
0
−0.5
−1
−1.5
0
4
5
0
0
5
10
−5
2
0
−2
−4
5
10
f1(t)
f2(t)
f3(t)
f4(t)
0
5
10
t (time)
t (time)
FIGURE 1.30
Plots of the function square of R.1.106.
CRC_47760_CH001.indd 33
CRC_47760_CH001.indd 33
7/25/2008 4:16:17 PM
7/25/2008 4:16:17 PM