Matlab seem to forget the Control Systems Toolbox after restart

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Carl Brundin 2016-5-13

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评论： Carl Brundin 2016-5-18

My script uses the tf-function, so I installed the Control Systems Toolbox. All is fine until I restart my computor. After that, Matlab gives me this error message: Undefined function or variable 'tf'.

I reinstalled Control Systems Toolbox again, and got the script going again, until I restart my computor - Again the same error message: Undefined function or variable 'tf'.

Is there another way of solving this problem? Path problem?

I use the 64-bit Matlab version R2016a.

Please help!

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Answer 1

Arkadiy Turevskiy 2016-5-16

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It seems like a problem with the path, not sure why it is happening. You can try explicitly adding the folder where Control System Toolbox in installed to your MATLAB path and saving it.

Check where Control System Toolbox is installed. For example you can do this

>>which tf

For me this returns: C:\Program Files\MATLAB\R2016a\toolbox\control\ctrlmodels\@tf\tf.m % tf constructor

Now you need to add the folder where Control System Toolbox is installed, and all subfolders added to the path:

>>addpath(genpath('C:\Program Files\MATLAB\R2016a\toolbox\control'));

Now save the path for future sessions:

>>savepath

HTH. Arkadiy