#Java for matlab series#
Many of our functions such as xmlread make use of more complicated series of calls to java objects. To change the Java version (not recommended) you can follow these instructions.įor instance instead of MATLAB's str2num you could use: Double's parseDouble. To determine the Java version use the command version( '-java'). The running version of the JRE depends on your version of MATLAB and operating system and determines what API functionality is available from MATLAB. You can use any public method in the Java SE API from the command line. Using Java from a MATLAB program is as simple as using a MATLAB function, particularly if you are used to using MATLAB package functions. My solution takes advantage of the freely available Apache Commons Codec package. Since there is no toolbox function for this, I decided to take advantage of a Java library since (a) I could use the same library on every platform (instead of needing a different pre-compiled binary) and (b) I am pretty comfortable with Java. This time I wanted to use a readily-available solution. At first I thought to implement the base64 algorithm myself in MATLAB, but I learned my lesson the hard way a few years ago writing my own md5 hash-computing program (don't ask). My solution to the image challenge involves encoding binary information from an image file as text through the base64 scheme. Or, if you don't have the time to do that, you can still win a t-shirt by sending us your desktop. The second challenge involving ActiveX will remain open until I get chance to write up its solution. I thought the problem of displaying a figure without an image file was too interesting to pass up, so I figured out the solution myself and put it up on the file exchange. For that reason, we have created a library called JTT, which have been implemented in Java to take advantages of this language specially from the pedagogical point of view.So far no one has taken me up on the extra credit from the Interactive Web Pages post. However the toolbox is limited to Matlab users, which can be an important restriction for many students. One of them is the successful Matlab-based toolbox TrueTime. This misunderstanding have required of new simulation tools to study the real-time control systems. Computation delay of the controller is negligible or controller deadlines are always critical, are wrongly assumed as true. Both engineers have made wrong assumptions about each phase. Typically, an embedded control system have been implemented in two unconnected phases by two kind of engineers: a control engineer and a computer engineer. In the GUI we can see how the increasing of execution time of the controller affects negatively to the control performance.Ĭontrol theory and real-time systems have both a long, but separated, tradition. There is also a slider to control the execution time and three buttons to control the simulation. Bottom plot, presents the schedule data of the task. Upper plot shows the signals reference, control and output of the system. The GUI of the simulation is shown in Figure 8. GUI of the virtual lab developed using the JTT-EJS approach The JTT library and some examples are online available on. The paper describes the ideas, implementation, and sample use of the new library both for pure Java programmers and for EJS users. EJS allows instructors, students, and researchers with less programming capabilities to create advanced interactive simulations in Java. The choice of Java increases considerably the usability of our library, because many educators program already in this language.īut also because the library can be easily used by Easy Java Simulations (EJS), a popular modeling and authoring tool that is increasingly used in the field of Control Education. Such simulations can improve considerably the learning and design of multitasking real-time systems. The library is based on the ideas and architecture of TrueTime, a toolbox of Matlab devoted to this topic, and allows Java programmers to simulate the performance of control processes which run in a real time environment. This paper introduces a new Open Source Java library suited for the simulation of embedded control systems.
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