Borrar filtros
Borrar filtros

how to generate square wave in matlab

268 visualizaciones (últimos 30 días)
md
md el 16 de Jun. de 2014
Comentada: Vedanta Mohapatra el 1 de Oct. de 2021
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.

Respuesta aceptada

Image Analyst
Image Analyst el 16 de Jun. de 2014
Editada: Image Analyst el 24 de Nov. de 2020
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;
  2 comentarios
TANMAYA KAANR
TANMAYA KAANR el 15 de Jun. de 2017
Just Put a saturation block with lower limit zero. It will give only Positive value.
Image Analyst
Image Analyst el 15 de Jun. de 2017
I don't know what that means. What is a "saturation block"? Is that Simulink? The poster said "in matlab" but if your function is for Simulink, then perhaps your post will help Simulink users.

Iniciar sesión para comentar.

Más respuestas (4)

Rashmil Dahanayake
Rashmil Dahanayake el 16 de Jun. de 2014
t=0:.001:1;
f=10;
sq=1000*0.5*(square(2*pi*f*t)+1);
plot(t,sq)

Bill Tubbs
Bill Tubbs el 26 de Mzo. de 2020
Based on Rashmil Dahanayake's idea I made a simple function to generate regular square waves for discrete time.
function sq = square_dt(n,period)
% Square wave in discrete time
repeats = n/period;
sq = square(2*pi*linspace(0,repeats-1/n,n));
end
(Works best when period is an even number)
Example
>> square_dt(10,4)
ans =
1 1 -1 -1 1 1 -1 -1 1 1
If you want only the positive cycles, modify the code like Rashmil's:
function sq = square_dtp(n,period)
% Square wave in discrete time
repeats = n/period;
sq = (square(2*pi*linspace(0,repeats-1/n,n))+1)/2;
end
Example
>> square_dtp(10,4)
ans =
1 1 0 0 1 1 0 0 1 1

udhaya ram  mohan
udhaya ram mohan el 18 de Oct. de 2016
i need to generate the square wave with positive cycle only please send me a code for it
  1 comentario
Walter Roberson
Walter Roberson el 18 de Oct. de 2016
Rashmil Dahanayake's Answer already only generates positive values.

Iniciar sesión para comentar.


pisini padmaja
pisini padmaja el 23 de Nov. de 2020
Editada: Image Analyst el 24 de Nov. de 2020
%square function%
clc;
clear all;
close all;
t=0:0.01:2;
x=sin(2*pi*t);
subplot(2,1,1);
plot(t,x,'g');
xlabel('time');
ylabel('amplitude');
title('square signal 318126512095');
subplot(2,1,2);
stem(t,x,'r');
xlabel('time');
ylabel('amplitude');
title('square sequence 318126512095');
  2 comentarios
Image Analyst
Image Analyst el 24 de Nov. de 2020
This does not look like an Answer for how to create a square wave. Here is what your code produces:
%square function%
clc;
clear all;
close all;
t=0:0.01:2;
x=sin(2*pi*t);
subplot(2,1,1);
plot(t,x,'g');
xlabel('time');
ylabel('amplitude');
title('square signal 318126512095');
subplot(2,1,2);
stem(t,x,'r');
xlabel('time');
ylabel('amplitude');
title('square sequence 318126512095');
Vedanta Mohapatra
Vedanta Mohapatra el 1 de Oct. de 2021
You have to use signum to generate some sort of square wave

Iniciar sesión para comentar.

Categorías

Más información sobre Language Fundamentals en Help Center y File Exchange.

Etiquetas

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by