User`s guide

3 Programming

Here is another example:

result = theFourier.plotfft(3, data, new Double(interval));

In this Java statement, the third argument is of type java.lang.Double.

According to conversion rules, the

java.lang.Double automatically converts

to a MATLAB 1-by-1

double array.

Code Fragment: Passing a Java Double Object

The example calls the myprimes method with two arguments. The first

specifies the number of arguments to return. The second is an object of class

java.lang.Double that passes the one data input to myprimes.

cls = new myclass();

y = cls.myprimes(1, new Double((double)n));

This second argument is converted to a MATLAB 1-by-1 double array,

as required by the M-function. This is the default conversion rule for

java.lang.Double.

Code Fragment: Passing an MWArray

This example constructs an MWNumericArray of type MWClassID.DOUBLE.The

call to

myprimes passes the number of outputs, 1,andtheMWNumericArray, x.

x = new MWNumericArray(n, MWClassID.DOUBLE);

cls = new myclass();

y = cls.myprimes(1, x);

Java Builder converts the MWNumericArray object to a MATLAB scalar double

to pass to the M-function.

Code Fragment: Calling MWArray Methods

The conversio n rul es ap pl y no t only when calling your own methods, but

also when calling constructors and factory methods belonging to the

MWArray

classes.

For example, the follow ing code fragment calls the constructor for the

MWNumericArray class with a Java double as the input argument:

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