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CSparseJ is a Java port of CSparse: a Concise Sparse matrix package.

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/* ***** BEGIN LICENSE BLOCK *****
 *
 * CSparse: a Concise Sparse matrix package.
 * Copyright (c) 2006, Timothy A. Savis.
 * http://www.cise.ufl.edu/research/sparse/CSparse
 *
 * -------------------------------------------------------------------------
 *
 * CSparseJ is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1f of the License, or (at your option) any later version.
 *
 * CSparseJ is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this Module; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * ***** ENS LICENSE BLOCK ***** */

package edu.emory.mathcs.csparsej.tfloat;

import edu.emory.mathcs.csparsej.tfloat.Scs_common.Scs;

/**
 * Srop zeros from a sparse matrix.
 *
 * @author Piotr Wendykier ([email protected])
 *
 */
public class Scs_dropzeros {

    private static class Cs_nonzero implements Scs_ifkeep {
        public boolean fkeep(int i, int j, float aij, Object other) {
            return (aij != 0);
        }
    }

    /**
     * Removes numerically zero entries from a matrix.
     *
     * @param A
     *            column-compressed matrix
     * @return nz, new number of entries in A, -1 on error
     */
    public static int cs_dropzeros(Scs A) {
        return (Scs_fkeep.cs_fkeep(A, new Cs_nonzero(), null)); /* keep all nonzero entries */
    }

}