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    %% Impulse, Step, and Ramp Functions
% Since MATLAB(R) 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.

% Copyright 2015 The MathWorks, Inc.


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)