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how to use heaviside step function?

I want to plot two functions using heaviside command, but I can't find information about this on the MATLAB help option.
The command I want to use is found on this link,
http://www.mathworks.com/help/symbolic/heaviside.html
I would like to know how to incorporate this function to my MATLAB, and also is you may, I would like to know other ways to plot a step function without using the stairs command.
Thank you for your time.

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Answer by Chetan Rawal on 4 Dec 2012
 Accepted Answer

The function you are refering to is from the Symbolic Math toolbox. You need the Symbolic Math Toolbox along with MATLAB to run it:
For your question, you could simply work with numbers. eg: Following is an (almost) heaviside function plot:
x = [1 2 3 4 4.001 5 6 7 8 9 10];
y = [0 0 0 0 1 1 1 1 1 1 1];
plot(x,y);
axis([1 10 -1 2]);

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