MATLAB BUILDER JA 2 Podręcznik Użytkownika Pobierz pdf (Strona 39)

How Does MATLAB Builder for Java H andle Data?

Overview of Classes and Methods in the Data Conversion

Class Hierarchy

The root of the data conversion class hierarchy is the MWArray abstract

class. The

MWArray class has the following subclasses representing the

major MATLAB types:

MWNumericArray, MWLogicalArray, MWCharArray,

MWCellArray,andMWStructArray.

Each subclass stores a reference to a native MATLAB array of that type.

Each class provides constructors and a basic set of methods for accessing

the underlying array’s properties and data. To be specific,

MWArray and the

classes derived from

MWArray pr ovide t he following:

• Constructors and finalizers to instantiate and dispose of MATLAB arrays

•

get and set methods to read and write the array data

• Methods to identify p roperties of the array

• Comparison methods to test the equality or order of the array

• Conversion methods to convert to other data types

Advantage of Using Data Conversion Classes

The MWArray data convers ion classes let you p ass native type p arameters

directly without using explicit data conversion. If y ou pass the same array

frequently, you might improve the performance of your program by storing

the array in an instance of one of the

MWArray subclasses.

Automatic Conversion to MATLAB Types

Note Because the conve rsio n process is a utomatic (in most cases), you do not

need to understand the conversion process to pass and return arguments with

MATLAB Builder for Java components.

When you pass an MWArray instan ce as an inp ut argument, the encapsu lated

MATLABarrayispasseddirectlytothemethodbeingcalled.

In contrast, if your code uses a native Java primitive or array as an input

parameter, Java Builder converts it to an instance of the appropriate

MWArray

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MATLAB BUILDER JA 2 Podręcznik Użytkownika Strona 39