Hello Muhammad Adil,

I am Preethi and I am writing in reference to your Technical Support Case #03167864 regarding ‘Struct contents reference from a non-struct array object.’.

I understand that you are seeing an error when trying to call a function of a serialized Java Object in parfor loop
One of the possible reasons would be that the Java class is added in the dynamic java classpath. The workers are not able to access the dynamic java classpath since it is specific to that session of MATLAB, and all the workers run on different MATLAB processes. Use one of the following two workarounds to make this work:

1) Please add the java class to the “static” java class path. Instructions on how to do this can be found in the following documentation link:
http://www.mathworks.com/help/matlab/matlab_external/bringing-java-classes-and-methods-into-matlab-workspace.html#f4867 <http://www.mathworks.com/help/matlab/matlab_external/bringing-java-classes-and-methods-into-matlab-workspace.html#f4867>

This will make sure that all MATLAB processes will have access to the same java class path.

2) The “javaaddpath” function to add entries to the dynamic Java class path can be executed on all the workers using the “pctRunOnAll” command as follows:

>pctRunOnAll javaaddpath(‘path’) %Replace ‘path’ with the appropriate path

Please make sure that the parallel pool is running before running this command.
I believe this will help in resolving the issue you are facing. I am thus marking this case as closed for now. If the issue persists, please feel free to reply to this email and I will be happy to reopen the case and help you further.

Please preserve the Reference ID in further correspondence on this query. This allows our systems to automatically associate your reply to the appropriate Case.

Sincerely,
Preethi Ayyamperumal
MathWorks Technical Support

Self-Service: https://www.mathworks.com/support/contact_us.html
File Exchange and MATLAB Answers: http://www.mathworks.com/matlabcentral/

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Both Matlab and Octave allow object-oriented scripting. An object can have its own fields and methods. The way it can be accomplished is slightly different for each of these languages. In Matlab, you can create a class and define its methods in the same file that you used to create the class. In Octave, you have to create a folder for a class. You put all the methods for that class in that folder as m-files.

Creating a Simple Class – MATLAB & Simulink

This simple class introduces the basic patterns and syntax for defining a class.

Creating a Class (GNU Octave (version 8.4.0))

Creating a Class (GNU Octave (version 8.4.0))

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Using MATLAB to Write Games

This is a somewhat odd topic in that one does not think of MATLAB when one thinks of writing games. I mean, seriously? MATLAB is an interpreted language, and thus slow, and is made for crunching math and plotting graphs. Not exactly game-worthy.

Matlab source code of some popular games such as sudoku and tic-tac-toe. This can help you glean what goes inside the code.

http://ef.engr.utk.edu/gs2011/computer/matlab-games/

Some games (and their codes) showcased on Mathworks and other sites.

Stellaria (Tech Demo) – The best MATLAB shooting game ever

If you think you have played the best MATLAB game before. Think again after you try this one.

http://joeweinhoffer.com/portfolio-items/lunar-lander/

Yet another game in Matlab: Risk. For those of you who are familiar.

RISK board game battle simulation – MATLAB Cody – MATLAB Central

Given two positive integer inputs, a (attacker army units) and d (defender army units) return the probablity of victory (from 0.000 to 1.000) to +- 0.02 accuracy. The rules are given below for those unfamiliar with the game. In the board game RISK battles are determined by the conflict of armies, namely the attacking army and the defending army.

Here is a nice article about the implementation of minesweeper in Matlab. It could be really useful for understanding how to develop a game board in Matlab.

http://wikis.swarthmore.edu/ENGR005_2009/index.php/MatLab_Minesweeper

Ability to draw voxels (cubes, cuboids) could be of some value, as it was showcased on a gaming site and is available through Mathworks.

Voxel

Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes

RoteAugen/flappybird-for-matlab

Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes

This tutorial on youtube about creating GUIs in Matlab with GUIDE could be useful. Review this as you listen to a nice song.
Create a simple game in matlab gui Part1

This is a nice tutorial and contains links and videos for famous games implemented in Matlab.

http://www.matlabtips.com/gaming-in-matlab/

Following is somebody’s website who has implemented numerous board games in Matlab. This can be really good to understand board development in Matlab.

MATLAB Fun Toolbox

This page contains my library of MATLAB m-files for a simple game and everything else that I make just for fun. All of these m-files are free and you may use or modify them as you like. To download the m-files, simply click the link on each m-file name and a pop-up window will appear, allowing…

I also wanted to list a few games that are implemented specifically in Octave, as many people do not have access to Matlab or they don’t like it. Here is an implementation of tic-tac-toe in Octave. This could be nice to understand how graphics are rendered in Octave.

GitHub – sinhas/TicTacToe: Tic-Tac-Toe minimax algorithm implementation in Octave

Tic-Tac-Toe minimax algorithm implementation in Octave – GitHub – sinhas/TicTacToe: Tic-Tac-Toe minimax algorithm implementation in Octave

This implementation of game of life in Octave can be really useful.

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This sounds like a really nice book that was written with the intention of teaching game programming with Matlab.

Matrices, Vectors, and 3D Math: A Game Programming Approach with MATLAB

Matrices, Vectors, and 3D Math provides a resource to learn standard topics in Linear Algebra and

Here is a nice tanks game called Staker that is showcased on Mathworks. It is written in Matlab. It could be helpful in understanding how Matlab renders graphics.

Staker v0.6

Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes

Here is another nice tanks game that uses graphics.

Renegade Legion: Centurion

This game is a turn based wargame that features two platoons of grav tanks battling it out.

This chess game in Matlab can help draw a board at least. It integrates well with external chess engines.

Chess Master

Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes

This is a very nice piece of code that shows you how to draw cellular automata in Matlab/Octave.

10 lines of Matlab code (works also in GNU Octave): a simple Game of Life
byu/martin123444 incellular_automata

You will find this very handy as it shows how to use imshow to display a bunch of images in a plot without borders.

How to Make a Borderless Subplot of Images in MATLAB | briandalessandro.com

A tutorial on how to remove the spacing between images when imshow() is used with subplot() in a MATLAB figure.

The second edition of the book, Artificial Intelligence for Games, by Ian Millington and John Funge can be found here.

The pdf of the book can be found here.

Finally, here are some links for pathfinding algorithms in Matlab.

A* (A Star) search for path planning tutorial

A tutorial that presents the A* search algorithm for determining the shortest path to a target.

A* Algorithm

Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes

Demonstration of Astar (A*)

Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes

A Star implemented in Matlab

Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes

Photo by Flikkersteph -5,000,000 views ,thank you!

urlread

This MATLAB function downloads the HTML web content from the specified URL into the character vector str.

Here is a link to its variant, urlread2(), which adds extra functionality to the original urlread(). urlread2 makes extensive use of Java’s apis for http client-server connections. The java source files can also be downloaded from the following link for urlread2.

urlread2

Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes

Here is documentation that describes the functionality of urlread2().

http://undocumentedmatlab.com/blog/expanding-urlreads-capabilities/

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GECCO 2015

This is CBBOC’s inaugural year. It’s designed to provide the GECCO community with detailed performance comparisons of a wide variety of meta-heuristics and hyper-heuristics on combinatorial problems, where the real-world problems which induce combinatorial problems have been categorized into those with no training time (good fit for out-of-the-box algorithms such as the Parameter-less Population Pyramid), those with short training time (good fit for typical evolutionary algorithms), and those with long training time (good fit for hyper-heuristics).

The TORCS simulator also has an interface for Matlab and Simulink. This means that controllers can be developed for TORCS using Matlab. Using Matlab simply means that the whole hassle of interfacing with TORCS should become a lot easier. The source code is present at GitHub.

VerifiableAutonomy/TORCSLink

TORCSLink – An interface between The Open Source Race Car Simulator (TORCS) and MATLAB/Simulink (or anything else…)

TORCS is also available through Ubuntu’s software center. You can install it from here.

TORCS

TORCS, The Open Racing Car Simulator, is a car racing simulation, which allows you to drive in races against opponents simulated by the computer. You can also develop your own computer-controlled driver (also called a robot) in C or C++. TORCS is GPL (version 2 or later).

The following video shows how TORCS works on a user’s desktop.

TORCS Fuzzy Logic Robot

An AI racing robot wrote by me and my friend Miłosz Kosobucki as final assignment for Fuzzy Set Theory course (winter 2009/2010) at Faculty of Mathematics and Computer Science, Adam Mickiewicz University in Poznań, Poland. It’s written in C and uses The Open Racing Car Simulator (http://torcs.sourceforge.net) API.

Photo by SFB579 Namaste

I have also been writing statements for a few interesting projects for simulated drones, that could be taken up as FYPs at the undergraduate level. For a more detailed review of these projects, please review them on the following links:

• Software Dovetailing of ECJ With UAV Playground.
• UAV Playground in Matlab.
• Dovetailing of ECJ With UAVPlayground Using Matlab or Octave.

These are all nice projects. An aspect worth noticing about all of these is that they involve UAV Playground. UAV Playground is a UAV simulator that runs in conjunction with the FlightGear simulator and Google Earth. The reason I chose it was that it is written in Java, and I wanted to port it to Matlab somehow. These projects are nice and are worth pursuing.

However, here I want to introduce a very project that can be accomplished solely with Matlab, with minimal involvement, whatsoever, with another, or any other, programming language, whatsoever. The reason for this digression for this has a basis in my recent discovery of Flight Simulator Interface for Matlab. With this tool, you can run FlightGear simulator with Simulink models. Have I introduced FlightGear to you in this tutorial? I must have done that elsewhere, of course! Stated shortly, FlightGear is an open source flight simulator, that is possibly also the best in its niche domain. With this interface, you can run FlightGear models through Matlab and/or Simulink. This should lead to a lot of time-saving for you if you want to work with flight simulators or development of UAVs. So following are the things that I expect you to do in this tutorial.

1. Download and install FlightGear on your machine, by following the guidelines on this Matlab page.
2. Run FlightGear with Simulink models and see how you can gain experience with using FlightGear through Matlab.
3. Browse and look for the machine learning models that you have available for Matlab.
4. Try to figure out a way that how you can integrate these, or similar, algorithms with the flight simulation interface.

You will find the following articles particularly useful for this project.

A Survey of Free Software for the Design, Analysis, Modelling, and Simulation of an Unmanned Aerial Vehicle

The objective of this paper is to analyze free software for the design, analysis, modelling, and simulation of an unmanned aerial vehicle (UAV). Free software is the best choice when the reduction of

Automatic control education using Flight Gear and MATLAB based virtual lab

In this paper, a virtual lab based on MATLAB and FlightGear flight simulator is discussed and developed. The virtual lab consists of number of experiments that enhances the understanding of fundamental concepts of classical control for undergraduate students.

An Error Occurred Setting Your User Cookie

In general, only the information that you provide, or the choices you make while visiting a web site, can be stored in a cookie. For example, the site cannot determine your email name unless you choose to type it.

NASA HL-20 with Optional FlightGear Interface – MATLAB & Simulink Example

This model shows how to model NASA’s HL-20 lifting body modeled with Simulink®, Stateflow® and Aerospace Blockset software.

FlightGear Route Manager – File Exchange – MATLAB Central

File exchange, MATLAB Answers, newsgroup access, Links, and Blogs for the MATLAB & Simulink user community

UAV Simulation Environment for Autonomous Flight Control Algorithms – ProQuest

This thesis presents the development of a UAV simulation environment for the design, analysis, and comparison of autonomous flight control laws. The simulation environment was developed in MATLAB/Simulink, with custom map generation software and FlightGear 3-D visualization. Graphical user interface of the simulation environment is user-friendly and all available options are discussed in detail.

Co-Simulation of Matlab and FlightGear for Identification and Control of Aircraft

The paper outlines the development of a co-simulation solution of Matlab and Flight- Gear in which the communication between these programs is done via UDP without needing further toolsets. The simulation and rendering is done by FlightGear. Flight measurement signals are sent to Matlab, which in turn sends back actuator input values computed by a flight control system.

Howto:Design an autopilot – FlightGear wiki

Why not make things slightly easier, before we start working on the autopilot? Since we will be updating the autopilot hundreds of times, making tiny adjustments each time, we don’t want to reload FlightGear every time. Therefore, we assign an “reload autopilot configuration” action to a key on our keyboard.

Flightgear Integrations

Audio: – social audio

The following video shows how FlightGear works on a user’s desktop.

FlightGear: Seneca II Flight

FlightGear: Seneca II Flight

You can find a lot more FlightGear resources on the following page.

More Flightgear Resources

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