PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

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 magni-

tudes between − 1 and + 1 , and a period of T = 2 π. 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.