I have purchased the Signal Processing Toolbox but still get an error when trying to use a function

I have purchased the Signal Processing Toolbox, but MATLAB still throws a "you need the Signal Processing Toolbox" error when I try to use the square function per the screenshot. I have tried reinstalling MATLAB and restarting the program.

Answer 1

[Star Strider]

I am not certain what the problem is.

imshow(imread('Screenshot 202....49.59 AM.png'))

First, run these from a script or your Command Window:

restoredefaultpath

rehash toolboxcache

If the problem persists after that, then Contact Support.

.

Answer 2

[Walter Roberson]

Depending exactly how you install the toolbox, situations can arise where a toolbox is installed but the license is not updated.

Try Help -> Licensing -> Update Current licenses