Error After Running Program

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Muhammad on 22 Mar 2013
Whenever I'm trying to run a following program on MATLAB6.5, I'm getting the following error
_*??? Undefined function or variable 'step'.
Error in ==> D:\Simulation Lab Softwares\Softwares\abc.m On line 4 ==> step (num,den)*_
%unit step response
num= [2 25]
den= [1 4 25]
step (num,den)
  1 Comment
Azzi Abdelmalek
Azzi Abdelmalek on 22 Mar 2013
Have you a Control System toolbox?

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Answers (2)

Image Analyst
Image Analyst on 22 Mar 2013
You do not have an array called step, or a function defined called step, either in that m-file, or any other step.m file on your search path.

Jason Ross
Jason Ross on 22 Mar 2013
There is a "step" function that's part of the Control System Toolbox for that release. If that toolbox isn't installed, you would get this error.
It's also possible that you are missing a file that your program needed to run where someone had defined "step".


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