PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

64 Practical MATLAB® Applications for Engineers

Example 1.7

Create the script fi le analog_plots that returns the plot of each of the real value exponen-

tial signals shown as follows over the range − 5 ≤ t ≤ 6.

a. f 1 (t) = e–tu(t)

b. f 2 (t) = e–^1

c. f 3 (t) = f 1 (–t)

d. f 4 (t) = – e–tu(t)

e. f 5 (t) = f 2 (t). [(u(t – 2) – u(t – 3))]

f. f 6 (t) = f 1 (t) + f 1 (–t)

g. f 7 (t) = f 5 (t – 1)

h. f 8 (t) = f 4 (t) + [(u(t – 2) – u(t – 3)]

MATLAB Solution

% Script file: analog _ plots

t = -6:0.01:6;

t0 = 0;

u0 = stepfun(t, t0);

f1 = exp(-t).*u0;

f2 = exp(-t);

f3 = fliplr(f1);

tt = fliplr(t);

f4 = -1.*f1;

figure(1)

subplot(2,2,1);

plot(t, f1);

title(‘f1(t) vs t,(Example 1.7)’);

ylabel(‘f1(t)’)

axis([-6 6 -.5 1.2]);grid on

subplot(2,2,2);

plot(t, f2);

title(‘f2(t) vs t,(Example 1.7)’);

ylabel(‘f2(t)’)

axis([-6 6 -10 200]);grid on

subplot(2,2,3);

plot(t, f3);

title(‘f3(t) vs t,(Example 1.7)’);

ylabel(‘f3(t)’)

axis([-6 6 -.5 1.2]);

grid on;

xlabel(‘t’)

subplot(2,2,4);

plot(t, f4);grid on;

title(‘f4(t) vs t,(Example 1.7)’);

ylabel(‘f4(t)’)

a xis([-6 6 -1.2 .5])

xlabel(‘t’);