MATLAB BUILDER JA 2 Guide de l'utilisateur télécharger pdf (Page 131)

Using Class Methods

Method Description

“maximumNonZeros”

on page 4-57

Returns the allocated capacity of a sparse array.

If the underlying array is nonsparse, this m ethod

returns the same value as

numberOfElements().

“numberOfNonZeros”

on page 4-58

Returns the number of nonzero elements in

a sparse array. If the underlying array is

nonsparse, this method returns the sam e value as

numberOfElements().

The examples that follow use the sparse MWArray object cons tructed below

using the “newSparse” on page 4-66 method of

MWNumericArray:

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.toString());

Here are the contents of the sparse MWArray:

(2,1) 50

(1,2) 10

(2,2) 60

(1,5) 40

(2,5) 90

isSparse. This method returns true if the MWArray object is sparse, and

false otherwise.

The prototype for the

isSparse method is as follows:

public boolean isSparse()

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MATLAB BUILDER JA 2 Guide de l'utilisateur Page 131