MATLAB BUILDER JA 2 Guida Utente Scaricare il pdf (Pagina 132)

100

101

4 Using MWArra y Classes

Input Parameters

None

Example — Testing an MWArray for Sparseness

Test the MWArray object A created previously for sparseness:

if (A.isSparse())

System.out.println("Matrix A is sparse");

When run, the example displays this output:

Matrix A is sparse

columnIndex. This method returns an array containing the column ind ex of

each element in the underlying MATLAB array.

The prototype for the

columnIndex method is as follows:

public int[] columnIndex()

Input Parameters

None

Example — Getting the Column Indices of a Sparse MWArray

Get the column indices of the elements of the sparse array:

System.out.print("Column indices are: ");

int[] colidx = A.columnIndex();

for(inti=0;i<5;i++)

System.out.print(colidx[i] + " ");

System.out.println();

When run, the example displays this output:

Column indices are: 1 2 2 5 5

4-56

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 291 292

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MATLAB BUILDER JA 2 Guida Utente Pagina 132

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