PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

Time Domain Representation of Continuous and Discrete Signals 37

R.1.114 For example, create the script fi le rect_pulses that returns rectangle plots with the

following specs:

a. f 1 (t) versus t, with mag[f 1 (t)] = 1 and width = 1

b. f 2 (t) versus t, with mag[f 2 (t)] = 2 and width = 3

c. f 3 (t) versus t, with mag[f 3 (t)] = 3 and width = 6

d. f 4 (t) versus t, with mag[f 4 (t)] = 4 and width = 9

MATLAB Solution

% Script file: rect_ pulses

t = -6:.1:6;

f1 = rectpuls(t,1);

f2 = 2*rectpuls(t,3);

f3 = 3*rectpuls(t,6);

f4 = 4*rectpuls(t,9);

subplot(2,2,1)

plot (t,f1)

ylabel (‘ Amplitude [f1(t)]’);xlabel(‘t (time)’);

axis ([-6 6 -0.5 1.5])

title(‘Rectpuls(t,1) vs. t’)

subplot(2,2,2)

plot(t,f2)

ylabel( ‘Amplitude [f2(t)]’); xlabel(‘t (time)’);

axis([-6 6 -0.5 2.5])

title(‘2*Rectpuls(t,3) vs. t’)

subplot(2,2,3)

tripuls(t,3) versus t

3*tripuls(t,10) versus t

1.5

1

0.5

0

−0.5

− 5 0 5

Amplitude [f1(t)]

Amplitude [f3(t)]

t (time)

Amplitude [f2(t)]

2.5

2

1.5

1

0.5

−0.5

− 55

0

0

t (time)

2*tripuls(t,5) versus t

4*tripuls(t,12) versus t

5 4 3 2 1 0

− 5 0 5

t (time)

Amplitude [f4(t)]

4

3

2

1

− 5 0 5

(^0) t (time)
FIGURE 1.33
Plot of the function tripuls of R.1.112.