how to generate square wave in matlab

354 次查看（过去 30 天）
md
md 2014-6-16
评论： Vedanta Mohapatra 2021-10-1
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.

请先登录，再回答此问题。

采纳的回答

Image Analyst
Image Analyst 2014-6-16
编辑：Image Analyst 2020-11-24
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 个评论
TANMAYA KAANR
TANMAYA KAANR 2017-6-15
Just Put a saturation block with lower limit zero. It will give only Positive value.
Image Analyst
Image Analyst 2017-6-15
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.

请先登录，再进行评论。

更多回答（4 个）

Rashmil Dahanayake
Rashmil Dahanayake 2014-6-16
t=0:.001:1;
f=10;
sq=1000*0.5*(square(2*pi*f*t)+1);
plot(t,sq)
Bill Tubbs
Bill Tubbs 2020-3-26
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 2016-10-18
i need to generate the square wave with positive cycle only please send me a code for it
pisini padmaja
pisini padmaja 2020-11-23
编辑：Image Analyst 2020-11-24
%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 个评论
Image Analyst
Image Analyst 2020-11-24
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 2021-10-1
You have to use signum to generate some sort of square wave

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Language Fundamentals 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by