MATLAB BUILDER JA 2 User's Guide download pdf (Page 87)

Guidelines for Working with MWArray Classes

Constructing Jagged Arrays

The previous examples constructed rectangular Java arrays and used these

arrays to initialize MATLAB arrays. Multidimensional arrays in Java are

implemented a s arrays of arrays, which meansthatitispossibletoconstruct

a Java array in which each row can have a different number of columns. Such

arrays are commonly referred to as jagged arrays.

MWNumericArray constructors support jagged arrays by constructing a

rectangular array and padding with zeros any miss ing elements. The

resulting MATLAB array will have a column count equal to the largest

column count in any row of the input array. For example, the following two

statements construct a 5-by-5

double matrix from a 5-by-5 Java double array

in which the number of columns in the ith row equals

double[][] pascalsTriangle = {

{1.0},

{1.0, 1.0},

{1.0, 2.0, 1.0},

{1.0, 3.0, 3.0, 1.0},

{1.0, 4.0, 6.0, 4.0, 1.0}

};

MWNumericArray a1 = new MWNumericArray(pascalsTriangle);

The resulting M ATLAB array has the following structure:

[10000

11000

12100

13310

14641]

Passing Arguments to Constructors as MWClassID. In some cases, the

constructor converts the input to the specified type passed as an

MWClassID

value. When this value is omitted, the inputs are converted according to

default conversion rules.

For example, each of the following statements creates a real scalar

double

array w ith a value of 1.0:

4-11

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 291 292

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MATLAB BUILDER JA 2 User's Guide Page 87