MATLAB BUILDER JA 2 Guia do Utilizador descarregar pdf (Página 57)

Passing Arguments to and from Java

M-function in the order in which they appear in the array. Here is an example

of how you might use the

mysum method in a Java program:

public double getsum(double[] vals) throws MWException

{

myclass cls = null;

Object[] x = {vals};

Object[] y = null;

try

{

cls = new myclass();

y = cls.mysum(1, x);

return ((MWNumericArray)y[0]).getDouble(1);

}

finally

{

MWArray.disposeArray(y);

if (cls != null)

cls.dispose();

}

In this example, an Object array of length 1 is created and initialized with

a reference to the supplied

double array. This argument is passed to the

mysum method. The result is known to be a scalar double, so the code returns

this

double value with the statement:

return ((MWNumericArray)y[0]).getDouble(1);

Cast the return value to MWNumericArray and invoke the getDouble(int)

method to return the f irst element in the array as a primitive double value.

Code Fragment: Passing Array Inputs. The next example performs

a more general calculation:

public double getsum(Object[] vals) throws MWException

{

myclass cls = null;

Object[] x = null;

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MATLAB BUILDER JA 2 Guia do Utilizador Página 57