hello, i am using matlab2016a student version, i was trying to construct a tree for that i have downloaded functions and i treid to drag and add them in the current folder then the problme started

everything went down, it is displaying so many errors for basic functions in matlab like when i typed fdatool in my command prompt it said some error, i uninstalled it and again installed it by downloading anothe setup file from my matlab account then the worst happened MY TOOLBOXES they got reduced by half i am pretty confused if anyone knows how to solve it please guide me i really need your advice. Thanks

[Samuel Chandu]

This appears in the command window when i start my MATLAB:

Struct contents reference from a non-struct array object.

Error in strncmp (line 28)
        K = strncmp(obj.Node, str, n);

Error in matlabrc (line 73)
        if strncmp(computer,'PC',2)

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
  at com.mathworks.mlwidgets.graphics.ModelStateFactory.createNoSelectionModelState(ModelStateFactory.java:251)
  at com.mathworks.mlwidgets.graphics.PlotToolSetFactory$3.parseComplete(PlotToolSetFactory.java:123)
  at com.mathworks.mlwidgets.graphics.ModelStateFactory$ProductInfoListener$1$1.run(ModelStateFactory.java:1032)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
  at java.awt.EventQueue.access$200(Unknown Source)
  at java.awt.EventQueue$3.run(Unknown Source)
  at java.awt.EventQueue$3.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.run(Unknown Source)

Answer 1

[Walter Roberson]

It looks to me as if you have accidentally introduced your own strncmp.m that is interfering with the official one. What shows up for

which -all strncmp

I would suggest you start with

restoredefaultpath

[Samuel Chandu]

This came up when i typed restoredefaultpath Struct contents reference from a non-struct array object.

Error in strncmp (line 28) K = strncmp(obj.Node, str, n);

Error in restoredefaultpath (line 22) if strncmp(computer,'PC',2)

Struct contents reference from a non-struct array object.

Thanks Mr Robertson

[Walter Roberson]

What shows up for

which -al strncmp

?

Answer 2

[Samuel Chandu]

when i typed clc to clear command window this dialog box comes up saying "Error using eval undefined function 'workspacefunc' for input arguments of type 'struct'"