在 MATLAB 之外运行 MATLAB 函数时，MatlabControl 中出现异常

Question

我需要帮助才能通过 MatlabControl 在 Java 和 MATLAB 之间建立连接。

首先我想在演练中测试代码，但每次我都遇到相同的异常：

myfunc.m：

function myfunc()
    disp('hello from MYFUNC')
end

Java：

class ShowImage {

 public static void main(String[] args)
        throws MatlabConnectionException, MatlabInvocationException
    {
         // create proxy
         MatlabProxyFactoryOptions options =
            new MatlabProxyFactoryOptions.Builder()
                .setUsePreviouslyControlledSession(true)
                .build();
        MatlabProxyFactory factory = new MatlabProxyFactory(options);
        MatlabProxy proxy = factory.getProxy();

        // call builtin function
        proxy.eval("disp('hello world')");

        // call user-defined function (must be on the path)
        proxy.eval("addpath('E:\\vm')");
        proxy.feval("myfunc");
        proxy.eval("rmpath('E:\\vm)");

        // close connection
        proxy.disconnect();

}}

这里有例外：

Exception in thread "main" matlabcontrol.MatlabConnectionException: Could not launch MATLAB. Command: [matlab, -r, javaaddpath 'C:\Users\walaa\Desktop\matlabcontrol-4.0.0.jar'; matlabcontrol.MatlabClassLoaderHelper.configureClassLoading(); javarmpath 'C:\Users\walaa\Desktop\matlabcontrol-4.0.0.jar'; matlabcontrol.MatlabConnector.connectFromMatlab('PROXY_RECEIVER_42dd44d9-815e-41ad-bec9-e469718b5710', 2100);]
    at matlabcontrol.RemoteMatlabProxyFactory.createProcess(RemoteMatlabProxyFactory.java:305)
    at matlabcontrol.RemoteMatlabProxyFactory.requestProxy(RemoteMatlabProxyFactory.java:116)
    at matlabcontrol.RemoteMatlabProxyFactory.getProxy(RemoteMatlabProxyFactory.java:134)
    at matlabcontrol.MatlabProxyFactory.getProxy(MatlabProxyFactory.java:81)
    at ShowImage.main(ShowImage.java:19)
Caused by: java.io.IOException: Cannot run program "matlab": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at matlabcontrol.RemoteMatlabProxyFactory.createProcess(RemoteMatlabProxyFactory.java:292)
    ... 4 more
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(Unknown Source)
    at java.lang.ProcessImpl.start(Unknown Source)
    ... 6 more

我不知道是什么问题，任何帮助将不胜感激！

Answer 1

我假设您使用的是来自here 的示例。显然它已经过测试并且可以工作，只要确保 MATLAB 在 Windows 路径上（错误消息表明它找不到程序“matlab.exe”）