How to plot this stepfunction

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Younes Alawaji
Younes Alawaji 2018-9-23
评论： Star Strider 2018-9-23
Hello,
I am trying to plot a step function can be seen below. Any help will be highly appreciated. Thank you.

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回答（1 个）

Star Strider
Star Strider 2018-9-23
For the unit step function, you can use the Symbolic Math Toolbox heaviside function, or this anonymous function:
ustp = @(t) +(t>0); % Simple Unit Step Function
I leave the rest to you.
Remember to use element-wise operations for the multiplications. See the documentation page on Array vs. Matrix Operations (link) and Vectorization (link).
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Younes Alawaji
Younes Alawaji 2018-9-23
编辑：Younes Alawaji 2018-9-23
Thank you for reaching back and trying your best to illustrate to me. I tried to run your sample but it gave me an error at the line: plot(t, f(t).*ustp(t-5)), it says that "ustp," does not exist. Below I have tried to plot it:
t = linespace(100, -50, 50,-150,-250,-300); %% These are the constant with the t function
u = @(t) [10, 5 , -5 , -15 , -25 , -30] ; %% the ones with the u function
plot(t,u); axis [-30 30 -100 100 ];
Is this is how to do the step function? Any inputs will be appreciated
Star Strider
Star Strider 2018-9-23
My pleasure.
My code is intended to illustrate how to combine the unit step function (my ‘ustp’ anonymous function) with another function to create the desired result. You cannot simply use it without modifying your code.
Also, you have to copy my ‘ustp’ function to the beginning of your script file. My code should then work.

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