MATLAB Answers

how can i draw input rectangular shape with specific iterations

2 views (last 30 days)
sandy jeak
sandy jeak on 19 Dec 2015
Commented: Star Strider on 19 Dec 2015
n=100
for k=1:n
if k<=25
r(k)=1
elseif k>25&k<=50
r(k)=-1
elseif k>50&k<=75
r(k)=1
else
r(k)=-1
end
end
plot (k,r(k))
This appears when running:
But I want this figure:

Answers (2)

Star Strider
Star Strider on 19 Dec 2015
sqwv = @(x) 1.*(((x > 0) & (x < 25)) | ((x > 50) & (x < 75))) - 1.*(((x > 25) & (x < 50)) | ((x > 75) & (x < 100)));
x = 0:100;
y = sqwv(x);
figure(1)
plot(x, y,'-b')
axis([0 100 -1.5 1.5])

Image Analyst
Image Analyst on 19 Dec 2015
You can use repmat(), like I do in my attached demo.
Or, if you have the Signal Processing Toolbox, you can use the square() function:
x = square(t,duty) generates a square wave with specified duty cycle, duty, which is a number between 0 and 100. The duty cycle is the percent of the period in which the signal is positive.

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