Error After Running Program

Hello,

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)*_

-----------PROGRAM----------------

%unit step response 

num= [2 25]
den= [1 4 25]
step (num,den)

[Azzi Abdelmalek]

Have you a Control System toolbox?

Answer 1

[Image Analyst]

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.

Answer 2

[Jason Ross]

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".