how to plot a piecewise function?

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Leonardo Wayne
Leonardo Wayne 2016-5-5
编辑： Stephen23 2016-5-5
I am trying to plot the function below using the following code but it is not correct. help?
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Stephen23
Stephen23 2016-5-5
编辑：Stephen23 2016-5-5
@Mohammad Abdalnasir Khalid Al-Hiyali: Please do not paste images of code: paste the code as text and then format it correctly using the {} Code button.

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回答（1 个）

Star Strider
Star Strider 2016-5-5
It would be best for you to copy your code, paste it to yout Question, and then use the {}Code button to format it.
You can replace your entire if block by one statement that multiplies a logical-index vector by the values of the function in that region. Use this assignment to ‘y’ instead:
y = (x<0.5).*(m*x+b) + ((x>=0.5) & (x<30.5)).*(upper_limit_y) + (x>30.5).*(-m*x+b);
I tested it and it works.

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