A) A step function has following characteristic 1for t > 0 -1 for t < 0...

a.

MATLAB CODE

clear all;
clc;
t=-10:0.01:10; % Time Vector
y=sign(t); % signum function

plot(t,y,'*'); % plot
grid on
title('Signum ');
xlabel('t (sec)')
ylabel('Amplitude');

b.

MATLAB CODE

clear all ;
clc ;
x=-4*pi:0.1:4*pi ; %axis defination

y=sinc(x) ; %sin(pi*x)/(pi*x)
plot(x,y,'r'); %plot
grid on
title('Sinc Function');
xlabel('t in sec')
ylabel('Amplitude');