MATLAB: How to generate square wave in matlab

square wave

Hi,

I intend to generate a square wave with respect to time by following characteristic:

I want to generate square-wave force demand of 1 KN at 10 Hz. That means amplitude will be between 0 to 1000 and time will be between 0 to 1 (sec) with .1 interval.

Please someone help me.

Best Answer

Make one period, then use repmat() to replicate as many times as you want.

% Now make one cycle with amplitude 1000 and 200 elements.
onePeriod = 1000 * [ones(1, 100), zeros(1, 100)];
% 200 elements is supposed to be 0.1 seconds so find out delta t.
dt = 0.1 / numel(onePeriod);
% Define number of cycles.
numCycles = 10;
% Copy this period that many times.
fullWaveForm = repmat(onePeriod, [1, numCycles]);
% Make time axis from 0 to 1 second.
t = dt * (0 : (numel(fullWaveForm) - 1));
% Now plot it.
plot(t, fullWaveForm, 'b-', 'LineWidth', 2);
FontSize = 20;
xlabel('Time (seconds)', 'FontSize', FontSize);
ylabel('Amplitude', 'FontSize', FontSize);
title('Square Wave With 10 Cycles', 'FontSize', FontSize);
grid on;

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MATLAB: Task for generating a wave

%Sine wave example

f=3; %frequency [Hz]

t=(0:1/(f*100):1);

a=2; %amplitude [V]

phi=0; %phase

y=a*sin(2*pi*f*t+phi); %formula

plot(t,y)

xlabel('Time') %label

ylabel('Amplitude') %label

title('Sine Wave)'); %Title

MATLAB: I need to plot the amplitude of the signals

Try not using so many elements - too many to display.

Try this:

clc;
close all;
clear;
workspace;
format long g;
format compact;
fontSize = 15;
%variables
Am=5; %message signal amplitude

Ac=10; %message signal amplitude
t= linspace(0, 0.04, 1500); %period
Fm=50; %message frequency
Fc=1000; %carrier frequency
%output graph preparation
m=Am*cos(2*pi*Fm*t); % Signal equation
c=Ac*cos(2*pi*Fc*t); % Carrier equation
%plot m(t) and its amplitude
subplot(2,3,1);
plot(t,m);
xlabel('time', 'FontSize', fontSize);
ylabel('m(t)', 'FontSize', fontSize);
title('Signal Equation', 'FontSize', fontSize);
% Put x axis in the right place.



ax = gca
ax.XAxisLocation = 'origin'
subplot(2,3,2);
plot(t,abs(m));
xlabel('time', 'FontSize', fontSize);
ylabel('m(t)', 'FontSize', fontSize);
title('Signal Amplitude', 'FontSize', fontSize);
%plot c(t) and its amplitude
subplot(2,3,3);
plot(t,c);
xlabel('time', 'FontSize', fontSize);
ylabel('c(t)', 'FontSize', fontSize);
title('Carrier Equation', 'FontSize', fontSize);
% Put x axis in the right place.
ax = gca
ax.XAxisLocation = 'origin'
subplot(2,3,4);
plot(t,abs(c));
xlabel('time', 'FontSize', fontSize);
ylabel('c(t)', 'FontSize', fontSize);
title('Carrier Amplitude', 'FontSize', fontSize);
% Put x axis in the right place.
ax = gca
ax.XAxisLocation = 'origin'
%Sketch the magnitude of the multiplication of m(t) with c(t).
y=m.*c;
subplot(2,3,5);
plot(t,y);
xlabel('time', 'FontSize', fontSize);
ylabel('m(t) .* c(t)', 'FontSize', fontSize);
title('Multiplication of m(t) with c(t)', 'FontSize', fontSize);
% Put x axis in the right place.
ax = gca
ax.XAxisLocation = 'origin'
subplot(2,3,6);
plot(t,abs(y));
xlabel('time', 'FontSize', fontSize);
ylabel('y(t)', 'FontSize', fontSize);
title('Amplitude of the multiplication', 'FontSize', fontSize);
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')

Best Answer

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MATLAB: Task for generating a wave

MATLAB: I need to plot the amplitude of the signals

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