heaviside not working in my script

Im trying to plot a step function in matlab and by looking around, the best thing to do is use heaviside function but some how it doesn't recognize it in my script. I went to search for functions in matlab, and that function doesn't even exist. How do you make a step function in matlab??

[Thorsten]

This question has been asked (and answered) before: http://www.mathworks.com/matlabcentral/answers/242109-what-is-the-problem-with-the-heaviside-function

Answer 1

[Steven Lord]

HEAVISIDE is a function in Symbolic Math Toolbox. Check the output of the VER function to see if you have this toolbox installed. If you don't, it's not a difficult function to write.

But if you want to create a stairstep plot, look at the STAIRS function.