how to plot a piecewise function?

I am trying to plot the function below using the following code but it is not correct. help?

[Stephen23]

@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.

Answer 1

[Star Strider]

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.