MatLab: even the provided plot example gets an error

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I bought MatLab yesterday, and am just exploring it.
But even the builtin plot example refuses to run....
Any ideas what's going on here?
>> openExample('graphics/CreateLinePlotExample')
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
> In exampleUtils.setupWorkDir (line 4)
In setupExample (line 18)
In openExample (line 29)
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
> In exampleUtils.copyIfMissing (line 8)
In exampleUtils.setupMainFile (line 5)
In setupExample (line 21)
In openExample (line 29)
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
> In matlab.codetools.internal.getActionForFileType (line 33)
In edit>getFileTypeEditor (line 659)
In edit>hasFileTypeEditor (line 651)
In edit>openEditor (line 204)
In edit>openWithFileSystem (line 498)
In edit (line 49)
In openExample (line 90)
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
> In matlab.codetools.internal.getActionForFileType (line 33)
In edit>getFileTypeEditor (line 659)
In edit>openEditor (line 205)
In edit>openWithFileSystem (line 498)
In edit (line 49)
In openExample (line 90)
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
Exception in thread "AWT-EventQueue-0": java.lang.NullPointerException
at sun.lwawt.macosx.CAccessibility.propertyChange(CAccessibility.java:83)
at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:328)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
at java.awt.KeyboardFocusManager.firePropertyChange(KeyboardFocusManager.java:1493)
at java.awt.KeyboardFocusManager.setGlobalFocusOwner(KeyboardFocusManager.java:575)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:603)
at java.awt.Component.dispatchEventImpl(Component.java:4760)
at java.awt.Container.dispatchEventImpl(Container.java:2297)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Warning: Function plot has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential
name conflict.
  2 Comments
Ken Atwell
Ken Atwell on 2 May 2019
Type:
which -all plot
and add the results to this posting.
Paul
Paul on 2 May 2019
Thankyou, I got help from the Discord channel just a few minutes ago.
I had saved my script as plot.m, and aparrently that was conflicting.
I started a new script and physically deleted all plot.m files and it started working

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