I plan to post an article about this sometime in the coming months. Hi, Thanks a lot for your efforts! I then created a java class and tried run the source file. I got errors which I believe concern my Java classpath as shown below;.
RemoteMatlabProxy is not public in matlabcontrol; cannot be accessed from outside package. MatlabInvocationException is never thrown in body of corresponding try statement —-.
Will — I suggest that you contact Josh Kaplan author of matlabcontrol directly or via the matlabcontrol webpage. I have a problem with Matlabcontrol. When I call multiple Matlab functions from Java while running only one application; one Matlab command window opens for every function I call.
Do you have any suggestions? David I have not used matlabcontrol for a while, but recall you have an option when connecting to either create a new MATLAB instance or connect to an existing one. It sounds like you are electing to create a new one each time. Its prototype is.
But I am unable to call the function. I am adding the path before calling the function using. Click here to cancel reply. Remote control of Matlab Last week I demonstrated using matlabcontrol to call Matlab from Java from within the Matlab application.
This article describes this wrapper JMI wrapper — local MatlabControl part 2 — An example using matlabcontrol for calling Matlab from within a Java class is explained and discussed This article explains JMI's core functionality Matlab callbacks for Java events — Events raised in Java code can be caught and handled in Matlab callback functions - this article explains how Variables Editor scrolling — The Matlab Variables Editor can be accessed to provide immediate scrolling to a specified cell location.
Next ». Hi, First of all I would like to thank you and Yair for the excellent enlightenments. Tx, Lior. I found them helpful. Thanks again. All the best. Thanks in advance. Regards Naresh. I got errors which I believe concern my Java classpath as shown below; matlabcontrol.
RemoteMatlabProxy is not public in matlabcontrol; cannot be accessed from outside package exception matlabcontrol. The type conversion in such cases is unpredictable, and may be inconsistent across Matlab versions. In such cases you are best off building a Java object with Matlab code and then getting the Java object you created.
The eval and feval methods were described in detail in my previous post. The functions will return the result, if any, as a Java object.
Due to the way the underlying JMI operates, it is necessary to know in advance the number of expected return arguments. Matlab built-in nargout function reveals this number. Some functions e. In this situation there is no major difference between using eval or feval in the above situation. However, if instead of taking the square root of 5 we want to take the square root of a variable, then eval is our only option.
Undefined function or method 'sqrt' for input arguments of type 'char'. Java exception occurred: matlabcontrol. MatlabInvocationException: Method could not return a value because of an internal Matlab exception at matlabcontrol. MatlabException: Undefined function or method 'sqrt' for input arguments of type 'char'. SendMatlabMessage Native Method at com. The second mtFeval argument, which specifies the arguments to the invoked Matlab function, can take any number of arguments as an array.
Therefore the following is acceptable:. This will return an array containing both of their square roots. Note that although two vales are returned, they are considered as only 1 since it is a single array that is returned. Multiple Matlab arguments can be specified in mtFeval using a cell array.
For example, consider the following equivalent formats note the different returned array orientation :. As we observed above, mtEval is really just calling mtFeval. This works because eval is a function, so feval can call it. An illustration:. Both mtFeval and mtEval have allowed us to interact with Matlab, but the effects are not shown in the Command Window.
There is a method that will allow us to do this:. For instance:. There are many more eval and feval methods in the Matlab class. Many of these methods are asynchronous, which means their effect on Matlab can occur after the method call returns. This is often problematic because if one method call creates a variable which is then used by the next call, there is no guarantee that the first call has completed or even begun by the time the second call tries to use the new variable.
Unlike mtEval and mtFeval , these methods are not static, meaning we must have an instance of the Java class Matlab:. Matlab 1faf67f0. Using this instance we will attempt to assign a variable and then retrieve it into a different variable.
Java exception occurred: com. SendMatlabMessage Native Method at com. If you run the above code you are not guaranteed to get that exception because of the nature of asynchronous method calls.
However, this inherent unpredictability makes it difficult to perform almost any sequential action. Therefore, it is best to stick to mtEval , mtFeval , and mtFevalConsoleOutput , where this type of exception will be very remote. Two particular methods that may come in handy are mtSet and mtGet , which are the Java proxies for the Matlab set and get functions — they accept a Matlab handle a double value and a property name a string and either set the value or return it.
Like Matlab, they also accept an array of property names. This can be used to update Matlab HG handles from within Java code, without needing to pass through an intermediary Matlab eval function:. Object[]: [3x1 double] 'My figure'. For instance, this allows for creating sophisticated Java GUIs with Swing and then being able to call Matlab code when the user clicks a button or moves a slider.
While the above Java example is quite simple, using a combination of all of the methods described throughout my previous post, a much more sophisticated program can be created. To explore the methods in more detail you can use the demo available here downloadable JAR. The demo uses a remote connection to Matlab, but the available methods are the same.
In my next and final article on this subject, I will explore controlling Matlab using matlabcontrol over a remote connection.
I am looking forward to your blog post about controlling Matlab using matlabcontrol over a remote connection. Thanks for all the effort you put into matlabcontrol! Today I will explain how to control Matlab from a remote Java session. I have been following your posts with interest. Here is a question. I tested the process in pure java and it works as it should. Matlabcontrol does not call fevalConsoleOutput and thus does not address the issue. I also tried implementing the com.
CompletionObserver just say implements CompletionObserver and add a completed method but I have not found out to get the java to wait until completion things I have tried locked up.
String cannot be referenced from a static context LocalMatlabProxy.
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