MATLAB BUILDER JA 2 Podręcznik Użytkownika Pobierz pdf (Strona 146)

4 Using MWArra y Classes

(1,4) 16.0000 +41.0000i

(2,5) 0 + 2.0000i

Example — Using newSparse with Row and Column Indices

Construct a sparse MWNumericArray from vector Adata:

double[] Adata = { 0, 10, 0, 0, 40, 50, 60, 0, 0, 90};

int[] ri = {1, 1, 1, 1, 1, 2, 2, 2, 2, 2};

int[] ci = {1, 2, 3, 4, 5, 1, 2, 3, 4, 5};

MWNumericArray A = MWNumericArray.newSparse(ri, ci,

Adata, MWClassID.DOUBLE);

System.out.println("A = " + A.toString());

When run, the example displays this output:

(2,1) 50

(1,2) 10

(2,2) 60

(1,5) 40

(2,5) 90

Example — Assigning Multiple Values to a Single Array Element

Create a sparse MWNumericArray using the rowindex and colindex

arguments, specifying multiple values for the array element at index (2, 5).

The result is that this element stores the sum of the values from

Adata(1),

Adata(7), Adata(8),andAdata(9), which is equal to 250.

double[] Adata = { 0, 10, 0, 0, 40, 50, 60, 70, 80, 90};

int[] ri = {1, 2, 1, 1, 1, 2, 2, 2, 2, 2};

int[] ci = {1, 5, 2, 3, 5, 1, 2, 5, 5, 5};

MWNumericArray A =

MWNumericArray.newSparse(ri, ci, Adata, 4, 5,

MWClassID.DOUBLE);

4-70

1 2 ... 141 142 143 144 145 146 147 148 149 150 151 ... 291 292

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MATLAB BUILDER JA 2 Podręcznik Użytkownika Strona 146