MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Uživatelský manuál stáhnout pdf (Strana 223)

Passing Data to a Java Method

5-53

Handling a Cell Array of Java Objects

You create a cell array of Java objects by using the MATLAB syntax

{a1,a2,...}. You index into a cell array of Java objects in the usual way, with

the syntax

a{m,n,...}.

The following example creates a cell array of two

Frame objects, frame1 and

frame2, and assigns it to variable frames.

frame1 = java.awt.Frame('Frame A');

frame2 = java.awt.Frame('Frame B');

frameArray = {frame1, frame2}

frameArray =

[1x1 java.awt.Frame] [1x1 java.awt.Frame]

The next statement assigns element {1,2} of the cell array frameArray to

variable

f = frameArray {1,2}

f =

java.awt.Frame[frame2,0,0,0x0,invalid,hidden,layout =

java.awt.BorderLayout,resizable,title=Frame B]

Other Data Conversion Topics

There are several remaining items of interest regarding the way MATLAB

converts its data to a compatible Java type. This includes how MATLAB

matches array dimensions, and how it handles empty matrices and empty

strings.

How Array Dimensions Affect Conversion

The term dimension, as used in this section, refers more to the number of

subscripts required to address the elements of an array than to its length,

width, and height characteristics. For example, a 5-by-1 array is referred to as

having one dimension, as its individual elements can be indexed into using only

one array subscript.

In converting MATLAB to Java arrays, MATLAB handles dimension in a

special manner. For a MATLAB array, dimension can be considered as the

number of nonsingleton dimensions in the array. For example, a 10-by-1 array

has dimension 1, and a 1-by-1 array has dimension 0. In Java, dimension is

1 2 ... 218 219 220 221 222 223 224 225 226 227 228 ... 407 408

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Uživatelský manuál Strana 223