%% Impulse, Step, and Ramp Functions
% Since MATLAB® is a programming language, an endless variety of different signals is possible. Here are some statements that generate a unit impulse, a unit step, a unit ramp, and a unit parabola.

t = (-1:0.01:1)';

impulse = t==0;
unitstep = t>=0;
ramp = t.*unitstep;
quad = t.^2.*unitstep;

%
% All of these sequences are column vectors that inherit their shapes from t. Plot the sequences.

plot(t,[impulse unitstep ramp quad])

%
% Generate and plot a square wave with period 0.5 and amplitude 0.81.

sqwave = 0.81*square(4*pi*t);
plot(t,sqwave)

% Copyright 2015 The MathWorks, Inc.