MATLAB: Which Toolbox is phase() in

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I have been using the trial version of matlab for the past month, however I recently bought the student version and while running my code I got the error
Undefined function or variable 'phase'.
Here are the following toolboxes I have installed (see after running "ver" command)
MATLAB                                                Version 9.4         (R2018a)
Simulink                                              Version 9.1         (R2018a)
Control System Toolbox                                Version 10.4        (R2018a)
DSP System Toolbox                                    Version 9.6         (R2018a)
Image Processing Toolbox                              Version 10.2        (R2018a)
Instrument Control Toolbox                            Version 3.13        (R2018a)
Optimization Toolbox                                  Version 8.1         (R2018a)
Signal Processing Toolbox                             Version 8.0         (R2018a)
Simulink Control Design                               Version 5.1         (R2018a)
Statistics and Machine Learning Toolbox               Version 11.3        (R2018a)
Symbolic Math Toolbox                                 Version 8.1         (R2018a)
Which toolbox do I need to get for the phase() function to work?
Thanks

Best Answer

phase() as a routine by itself is part of the System Identification Toolbox, in the "obsolete" category.
phase() is also a method of the newer iddata() class from the System Identification Toolbox.
But what you probably want is angle() followed by unwrap(), which is part of basic MATLAB.
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