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MATLAB grader error when running code

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I'm using MATLAB grader for an assignment in my class, and this assignment has worked before, but now is not. The code that's being run is this:
num1 = [1]; %numerator of filter
den1 = [1 1]; %denominator of filter
filter1 = tf(num1, den1) %Filter transfer function object
And the error:
Undefined function 'tf' for input arguments of type 'double'.
Error in solution (line 3)
filter1 = tf(num1, den1) %Filter transfer function object
KALYAN ACHARJYA on 21 Nov 2019
Edited: KALYAN ACHARJYA on 21 Nov 2019
When I checked, no error
filter1 =
s + 1
Continuous-time transfer function.
Diane Peters
Diane Peters on 21 Nov 2019
Wow, that's weird. My student showed me the error and then I went into learner preview and saw it myself.

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Accepted Answer

Cris LaPierre
Cris LaPierre on 1 Dec 2019
The likely problem is that your course is running only using base MATLAB, but it needs to have the Control System toolbox in order to run the tf function.
For courses being offered on, you need to specifically add the products (toolboxes) you want your students to have access to to your course. See this page in the documentation to see how to add the Control System toolbox to your coures.

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