org.youscope.plugin.matlabscripting

Class LocalMatlabProxy

java.lang.Object

org.youscope.plugin.matlabscripting.LocalMatlabProxy

public final class LocalMatlabProxy
extends java.lang.Object

Allows for calling MATLAB from within MATLAB. All of the methods in this class can be called from any thread. The way methods are relayed to MATLAB differs depending on whether or not the methods were invoked on the main MATLAB thread; unexpected behavior may occur if methods are invoked from both the main MATLAB thread and any other thread. Any of the methods that are relayed to MATLAB may throw exceptions. Exceptions may be thrown if an internal MATLAB exception occurs.

Author:

Joshua Kaplan

Method Summary

Modifier and Type	Method and Description
static void	eval(java.lang.String command) Evaluates a command in MATLAB.
static void	exit() Exits MATLAB.
static void	feval(java.lang.String functionName, java.lang.Object[] args) Calls a MATLAB function with the name functionName.
static java.lang.Object	getVariable(java.lang.String variableName) Gets the value of the variable named variableName from MATLAB.
static java.lang.Object	returningEval(java.lang.String command, int returnCount) Evaluates a command in MATLAB.
static java.lang.Object	returningFeval(java.lang.String functionName, java.lang.Object[] args) Calls a MATLAB function with the name functionName.
static java.lang.Object	returningFeval(java.lang.String functionName, java.lang.Object[] args, int returnCount) Calls a MATLAB function with the name functionName.
static void	setEchoEval(boolean echo) Allows for enabling a diagnostic mode that will show in MATLAB each time a Java method that calls into MATLAB is invoked.
static void	setVariable(java.lang.String variableName, java.lang.Object value) Sets the variable to the given value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

exit

public static void exit()
                 throws MatlabInvocationException

Exits MATLAB.

Throws:

MatlabInvocationException

eval

public static void eval(java.lang.String command)
                 throws MatlabInvocationException

Evaluates a command in MATLAB. The result of this command will not be returned.

This is equivalent to MATLAB's eval(['command']).

Parameters:

command - the command to be evaluated in MATLAB

Throws:

MatlabInvocationException

See Also:

returningEval(String, int)

returningEval

public static java.lang.Object returningEval(java.lang.String command,
                                             int returnCount)
                                      throws MatlabInvocationException

Evaluates a command in MATLAB. The result of this command can be returned.

This is equivalent to MATLAB's eval(['command']).

In order for the result of this command to be returned the number of arguments to be returned must be specified by returnCount. If the command you are evaluating is a MATLAB function you can determine the amount of arguments it returns by using the nargout function in the MATLAB Command Window. If it returns -1 that means the function returns a variable number of arguments based on what you pass in. In that case, you will need to manually determine the number of arguments returned. If the number of arguments returned differs from returnCount then either null or an empty String will be returned.

Parameters:

command - the command to be evaluated in MATLAB

returnCount - the number of arguments that will be returned from evaluating the command

Returns:

result of MATLAB eval

Throws:

MatlabInvocationException

See Also:

eval(String)

feval

public static void feval(java.lang.String functionName,
                         java.lang.Object[] args)
                  throws MatlabInvocationException

Calls a MATLAB function with the name functionName. Arguments to the function may be provided as args, if you wish to call the function with no arguments pass in null. The result of this command will not be returned.

The Objects in the array will be converted into MATLAB equivalents as appropriate. Importantly, this means that any String will be converted to a MATLAB char array, not a variable name.

Parameters:

functionName - name of the MATLAB function to call

args - the arguments to the function, null if none

Throws:

MatlabInvocationException

See Also:

returningFeval(String, Object[], int), returningFeval(String, Object[])

returningFeval

public static java.lang.Object returningFeval(java.lang.String functionName,
                                              java.lang.Object[] args)
                                       throws MatlabInvocationException

Calls a MATLAB function with the name functionName. Arguments to the function may be provided as args, if you wish to call the function with no arguments pass in null.

The Objects in the array will be converted into MATLAB equivalents as appropriate. Importantly, this means that any String will be converted to a MATLAB char array, not a variable name.

The result of this function can be returned. In order for a function's return data to be returned to MATLAB it is necessary to know how many arguments will be returned. This method will attempt to determine that automatically, but in the case where a function has a variable number of arguments returned it will only return one of them. To have all of them returned use returningFeval(String, Object[], int) and specify the number of arguments that will be returned.

Parameters:

functionName - name of the MATLAB function to call

args - the arguments to the function, null if none

Returns:

result of MATLAB function

Throws:

MatlabInvocationException

See Also:

feval(String, Object[]), returningFeval(String, Object[])

returningFeval

public static java.lang.Object returningFeval(java.lang.String functionName,
                                              java.lang.Object[] args,
                                              int returnCount)
                                       throws MatlabInvocationException

Calls a MATLAB function with the name functionName. Arguments to the function may be provided as args, if you wish to call the function with no arguments pass in null.

The Objects in the array will be converted into MATLAB equivalents as appropriate. Importantly, this means that any String will be converted to a MATLAB char array, not a variable name.

The result of this function can be returned. In order for the result of this function to be returned the number of arguments to be returned must be specified by returnCount . You can use the nargout function in the MATLAB Command Window to determine the number of arguments that will be returned. If nargout returns -1 that means the function returns a variable number of arguments based on what you pass in. In that case, you will need to manually determine the number of arguments returned. If the number of arguments returned differs from returnCount then either only some of the items will be returned or null will be returned.

Parameters:

functionName - name of the MATLAB function to call

args - the arguments to the function, null if none

returnCount - the number of arguments that will be returned from this function

Returns:

result of MATLAB function

Throws:

MatlabInvocationException

See Also:

feval(String, Object[]), returningFeval(String, Object[])

setVariable

public static void setVariable(java.lang.String variableName,
                               java.lang.Object value)
                        throws MatlabInvocationException

Sets the variable to the given value.

Parameters:

variableName -

value -

Throws:

MatlabInvocationException

getVariable

public static java.lang.Object getVariable(java.lang.String variableName)
                                    throws MatlabInvocationException

Gets the value of the variable named variableName from MATLAB.

Parameters:

variableName -

Returns:

value

Throws:

MatlabInvocationException

setEchoEval

public static void setEchoEval(boolean echo)
                        throws MatlabInvocationException

Allows for enabling a diagnostic mode that will show in MATLAB each time a Java method that calls into MATLAB is invoked.

Parameters:

echo -

Throws:

MatlabInvocationException