Dot indexing is not supported for variables of this type.

Hello Matlab Community,

I was working on making scenarios using drivingScenario class and its methods, but i encounter some errors using, the plot function used for Creating a new scenario plot.

a test a simple code :

s = drivingScenario();
car = vehicle(s, 'ClassID', 1);
chasePlot(car);

the log of the command is this :

Dot indexing is not supported for variables of this type.

Error in matlab.ui.internal.JavaMigrationTools>suppressWarning (line 101)
if s.matlab.ui.internal.ForceJavaMigrationWarnings.ActiveValue

Error in matlab.ui.internal.JavaMigrationTools.suppressedJavaFrame (line 29)
            cleanupObj =
            suppressWarning('MATLAB:ui:javaframe:PropertyToBeRemoved');

Error in matlab.uitools.internal.uimode/createuimode (line 35)
    hFrame =
    handle(matlab.ui.internal.JavaMigrationTools.suppressedJavaFrame(hFig));

Error in uimode (line 111)
    hMode.createuimode(handle(hObj),name);

Error in zoom>locGetMode (line 556)
    hMode = uimode(hFig,'Exploration.Zoom');

Error in zoom (line 297)
hMode = locGetMode(hFigure);

Error in driving.scenario.Plot/setupGraphics (line 204)
                z = zoom(hAxes);

Error in driving.scenario.Plot (line 46)
            setupGraphics(obj);

Error in drivingScenario/plot (line 69)
p = driving.scenario.Plot(varargin{:}, ...

Error in driving.scenario.Actor/chasePlot (line 121)
        plot(obj.Scenario, ...  

[Adam Danz]

I do not have the Automated Driving Toolbox, unfortunately, so I'm limited in how I can help.

I assume scenario is non-empty drivingScenario object.

It may be helpful to run

dbstop if error

then run the code again so the program pauses in debug mode at the source of the error (probably line 121 in driving.scenario.Actor/chasePlot). Then you can investigate and tell us what obj.Scenario is and what it looks like.

Run

dbclear if error

to turn off the debug feature when there are errors.

[Image Analyst]

What is obj? Evidently it's not a structure or a class. So what is it? What does this show:

obj
whos obj
methods(obj)
properties(obj)
fieldnames(obj)

If any one of those throws an error, try to continue with the rest of the lines and tell us what they all say.

[Adam Danz]

Also, the "..." at the end of your error message suggests that we don't see the full error message. Seeing the full error message is helpful.

[lak-hal ouahid]

I activate the debugging mode, using the command "dbstop if error" as Adam Danz suggests, I clear all variable, and close all window.

the output of the command is pointer to the upper stack function :

101 if s.matlab.ui.internal.ForceJavaMigrationWarnings.ActiveValue
>>whos
  Name      Size            Bytes  Class        Attributes

  c         0x0                 0  onCleanup              
  id        1x39               78  char                   
  s         1x1                 8  double   

[lak-hal ouahid]

>>  if s.matlab.ui.internal.ForceJavaMigrationWarnings.ActiveValue
  

[Adam Danz]

From debug mode, put a break point at driving.scenario.Actor/chasePlot (line 121) and let us know what obj and obj.Scenario are.

[lak-hal ouahid]

the method chasPlot has this signature :

function chasePlot(obj, varargin)

and call plot function, with this argument:

plot(obj.Scenario, ...

obj is actorHandler, it is car vehicle

[lak-hal ouahid]

the car vehicle is :

car = 

  Vehicle with properties:

               ActorID: 1
               ClassID: 1
             PlotColor: [0 0.4470 0.7410]
              Position: [0 0 0]
              Velocity: [0 0 0]
                   Yaw: 0
                 Pitch: 0
                  Roll: 0
       AngularVelocity: [0 0 0]
                Length: 4.7000
                 Width: 1.8000
                Height: 1.4000
                  Mesh: [1×1 extendedObjectMesh]
            RCSPattern: [2×2 double]
      RCSAzimuthAngles: [-180 180]
    RCSElevationAngles: [-90 90]
         FrontOverhang: 0.9000
          RearOverhang: 1
             Wheelbase: 2.8000

[Adam Danz]

What is obj, though? To get that value, you need to set a break point at plot(obj.Scenario,... , run the code, and then look at obj (select obj and hit F9 to print its value from debug mode to the command window).

Please don't share copyrighted code, though. It's nice to see it but it but don't share more than a line or so if necessary.

[lak-hal ouahid]

The problem is related to my current folder, which has the functions that make the plot function crash. when i change the folder is just work fine.

I will check my functions to search for interference.

Thinks Adam Danz, for the debugging tricks.

[Adam Danz]

Hmmm, you might have another function named "plot" in the problematic directory that is overriding this line: plot(obj.Scenario,...

[lak-hal ouahid]

learning the hard way.

[Adam Danz]

"An expert is a person who has made all the mistakes that can be made in a very narrow field."

-Niels Bohr

[Image Analyst]

lak-hal, why are you not answering my question, or Adam's? Again, do this and tell us what you see about obj - not other variables that we don't care about:

obj
whos obj
methods(obj)
properties(obj)
fieldnames(obj)

Since your error is on this line:

plot(obj.Scenario, ...

it's obj that we need to learn about, not s, not car, not anything else (yet). Just because you are "learning the hard way" does not mean we want to help you the hard way. Make it easy for us to help you, not hard.

https://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

"An expert is one who knows more and more about less and less until he knows absolutely everything about nothing." Nicholas Butler, President of Columbia University.

[lak-hal ouahid]

Thank you, Guys, And All the Community.

I truly apologize Image Analyst for not responding, because the problem was, that matlab did not know which function to use, because, I wrote some functions that i defined to interact with scenerio class, actors, ... and it was a bad code.

Next time, I be happy to read the 'How to Ask Question In Matlab' before asking, but before, i will debug my code first.