how can i draw input rectangular shape with specific iterations

Question

sandy jeak 2015-12-19

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评论： Star Strider 2015-12-19

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:

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Star Strider 2015-12-19

See: how can i draw this figure

Image Analyst 2015-12-19

In general, you would not use & in that situation (your "if" test), you'd use &&, though in this case it won't matter.

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Answer 1

Star Strider 2015-12-19

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在 MATLAB Online 中打开

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])

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Answer 2

Image Analyst 2015-12-19

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rectangle_wave.m

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.