PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

Time Domain Representation of Continuous and Discrete Signals 39

R.1.118 As an additional example, create the script fi le triang_pulses that returns the plots

of triangular waves with 3 , 4 , 5 , and 2 cycles, respectively, and unit magnitude,

over the range 0 ≤ t ≤ 1.

MATLAB Solution

% Script file: triang _ pulses

% echo on

t =0:0.001:1;

subplot(2,2,1)

d1 = [0:.33:1]; % 3 cycles

y1 = pulstran(t,d1,’tripuls’,.25);

plot (t,y1)

title (‘3 triangular cycles’);

axis ([0 1 -0.5 1.5]);

ylabel(‘Amplitude’) ;

subplot(2,2,2)

da = [0:.25:1];

y2 = pulstran(t,da,’tripuls’,.25); % 4 cycles

plot(t,y2);

title(‘4 triangular cycles’);

axis([0 1 -0.5 1.5]);

ylabel(‘Amplitude’) ;

subplot(2,2,3)

d3 = [0:.20:1]; % 5 cycles

y3 = pulstran(t,d3,’tripuls’,.1);

plot(t,y3);

title(‘5 triangular cycles’);

axis ([0 1 -0.5 1.5]);

xlabel(‘time’)

ylabel(‘Amplitude’) ;

d4 = [0:.5:1]; % 2 cycles

subplot(2,2,4)

y4 = pulstran(t,d4,’tripuls’,.4);

plot (t,y4)

Plot using (squar, t) = gensig(square,3,9,0.1)

1

0.8

Amplitude

0.6

0.4

0.2

0

0123456789

time

FIGURE 1.35

Plot of R.1.117.