How to generate the rectangular signal from the image below using square function :

2021 3 20
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更新时间：2021 3 20
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Image Analyst
Image Analyst 2021-3-20
How did you create the image in the first place? Since you created it, you must have the data. Why do you need to go from saved screenshot image to data when you should already have the data?
Sirbu Vladimir
Sirbu Vladimir 2021-3-20
This image is given by the teacher. I have to write the code with necessary data to generate a graph as in the image.

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Cris LaPierre
Cris LaPierre 2021-3-20
编辑：Cris LaPierre 2021-3-20

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Your teacher has gone so far as to even tell you what function to use. If you'd even looked at the documentation for square, you'd have the answer to your question already.
Image Analyst
Image Analyst 2021-3-20
编辑：Image Analyst 2021-3-20

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So you DON'T need to generate the array from doing image processing on the image itself. You just have to create an array that, when plotted, would look like the image. So I imagine he told you about the zeros() function for creating an array 70 long, and the equals operator to assign indexes from 20 to 40 to 1. So in 4 very simple lines of code, you should be able to do it.
y = zer............
y(.......... = ........
plot(y................
grid on

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