empad the matlab into java

[sugir1987]

how can i use the matlab(matlab function) into java

[stultuske]

you mean this?

[sugir1987]

i got the code from web but error is here plese help me

import java.lang.System.*;

import com.mathworks.jmi.*;

public class MatlabControl {
Matlab matlab = null; //this is the com.mathworks.jmi.Matlab class,which has functionality allowing one to interact with the matlab session.
boolean useCb=false;
Object returnVal;
String callbackFunction;

/***************CONSTRUCTORS****************/
/*** usually, the default constructor with no arguments is fine.
 * Sometimes, a callback function is useful.  A callback function
 * is allows the user to pass the command and its arguments to a
 * matlab function, which will figure out the best way to executue
 * it, instead of trying to execute it directly from java.  This
 * is often useful for handling/printing errors as well as dealing
 * with native matlab data types, like cell arrays.  The cell
 * array is not really converted to a java type, only the handle
 * of the cell array is converted to a java type, so often a
 * matlab callback function is useful for dealing specially with
 * cell arrays, etc.
 ***/

public MatlabControl() {
    this(false);
}

public MatlabControl(boolean useCallback) {
this(useCallback,new String("matlabControlcb"));
}

public MatlabControl(boolean useCallback, String CallBackFunction) {
    try {
        if (matlab == null)
            matlab = new Matlab();//this command links to the current matlab session
    } catch (Exception e) {
    System.out.println(e.toString());
    }
    returnVal = new String("noReturnValYet");
    this.useCb=useCallback;
callbackFunction=CallBackFunction;
}

/***************USER-LEVEL FUNCTIONS****************/
/***call these from any java thread (as long as the thread
 * originated from within matlab)
 ***/

/**Evaluate a string, Matlab script, or Matlab function**/
public void eval(String Command) {
    Matlab.whenMatlabReady(new MatlabEvalCommand(Command,useCb));
}

/**Evaluate a Matlab function that requires arguments.  Each element of
 the "args" vector is an argument to the function "Command"**/
public void feval(String Command, Object[] args) {
    Matlab.whenMatlabReady(new MatlabFevalCommand(Command, args,useCb));
}

/**Evaluate a Matlab function that requires arguments and provide return arg.
 * Each element of the "args" vector is an argument to the function "Command"**/
public Object blockingFeval(String Command, Object[] args) throws InterruptedException {
    returnVal = new String("noReturnValYet");
    Matlab.whenMatlabReady(new MatlabBlockingFevalCommand(Command, args, useCb, this));
synchronized(returnVal){
    if (returnVal.equals(new String("noReturnValYet"))) {
             returnVal.wait();
        }
    }
    return returnVal;
}

/**Echoing the eval statement is useful if you want to see in
 * matlab each time that a java function tries to execute a matlab
 * command **/
public void setEchoEval(boolean echo){
Matlab.setEchoEval(echo);
}

/**********TEST FUNCTIONS***********************/
/***call these functions from within Matlab itself.  These are examples of the general execution order:
1. instantiate java object from matlab
2. spawn a new Java thread
3. call matlab functions from new java thread

EXAMPLE (from matlab prompt):

>> mc=MatlabControl;
>> mc.testEval('x = 5')
x =
       5
> mc.testFeval('help',{'sqrt'})
  SQRT    Square root.
     SQRT(X) is the square root of the elements of X. Complex
     results are produced if X is not positive.

     See also SQRTM.

     Overloaded methods
     help sym/sqrt.m

>> mc.testBlockingFeval('sqrt',{x})
       2.2361
****/

public void testEval(final String Command) {
class Caller extends Thread{
     public void run(){
          try{
               eval(Command);
          } catch(Exception e){
      //                System.out.println(e.toString());
      }
     }
}
Caller c = new Caller();
c.start();
}

public void testFeval(final String Command, final Object[] args) {
class Caller extends Thread{
     public void run(){
          try{
               feval(Command, args);
          } catch(Exception e){
      //                System.out.println(e.toString());
      }
     }
}
Caller c = new Caller();
c.start();
}

public void testBlockingFeval(final String Command, final Object[] args) {
class Caller extends Thread{
     public void run(){
          try{
               Object rets[] = new Object[1];
               rets[0] = blockingFeval(Command, args);
               feval(new String("disp"),rets );
          } catch(Exception e){
      //                System.out.println(e.toString());
      }
     }
}
Caller c = new Caller();
c.start();
}



/********   INTERNAL FUNCTIONS AND CLASSES  *******/

public void setReturnVal(Object val) {
    synchronized(returnVal){
        Object oldVal = returnVal;
        returnVal = val;
        oldVal.notifyAll();
    }
}

/** This class is used to execute a string in Matlab **/
protected class MatlabEvalCommand implements Runnable {
    String command;
    boolean useCallback,eval;
    Object[] args;

    public MatlabEvalCommand(String Command, boolean useCallback) {
        command = Command;
        this.useCallback = useCallback;
    eval=true;
        args=null;
    }

    protected Object useMatlabCommandCallback(String command, Object[] args){
        int numArgs = (args==null)? 0 : args.length;
        Object newArgs[] = new Object[numArgs+1] ;
        newArgs[0]=command;
        for(int i=0;i<numArgs;i++){
            newArgs[i+1] = args[i];
        }
        try{
            return matlab.mtFevalConsoleOutput(new String("matlabControlcb"), newArgs, 0);
        }
        catch(Exception e){
    //                System.out.println(e.toString());
    return null;
    }
    }

    public void run() {
        try {
            if(useCallback){
                useMatlabCommandCallback(command, args);
            }
            else if(eval){
                matlab.evalConsoleOutput(command);
            }
            else{
                matlab.fevalConsoleOutput(command, args, 0, null);
            }
        } catch (Exception e) {
            System.out.println(e.toString());
        }
    }
}

/** This class is used to execute a function in matlab and pass paramseters**/
protected class MatlabFevalCommand extends MatlabEvalCommand {

    public MatlabFevalCommand(String Command, Object[] Args, boolean useCallback) {
        super(Command, useCallback);
        args = Args;
    eval=false;
    }

}

/** This class is used to execute a function in matlab and pass paramseters
 *  and it also return arguments**/
protected class MatlabBlockingFevalCommand extends MatlabFevalCommand {
    MatlabControl parent;

    public MatlabBlockingFevalCommand(String Command, Object[] Args, boolean useCallback, MatlabControl parent) {
        super(Command, Args, useCallback);
        this.parent=parent;
    }

    public void run() {
        try {
            if(useCallback){
                parent.setReturnVal(useMatlabCommandCallback(command, args));
            }
            else{
                parent.setReturnVal(matlab.mtFevalConsoleOutput(command, args, 0));
            }
        } catch (Exception e) {
    //                System.out.println(e.toString());
        }
    }
}

}

here error is import com.mathworks.jmi.*;