How to plot this stepfunction

Hello,

I am trying to plot a step function can be seen below. Any help will be highly appreciated. Thank you.

Answer 1

[Star Strider]

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).

[Younes Alawaji]

Can you please explain more! I tried but no success can you direct me how to plot at least the first one? Appreciate any inputs!

[Star Strider]

I will give you an illustration, and let you take it from here:

t = linspace(-10, 20, 1E+6);
f = @(t) sin(2*pi*t).*cos(2*pi*t*0.1);

figure
plot(t, f(t).*ustp(t-5))
grid

Note specifically the argument to ‘ustp’ with respect to the resulting plot.

[Younes Alawaji]

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]

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.