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A 100% Java sparse and dense matrix library.

There is a newer version: 0.6.0

/*
 * Copyright 2011-2013, by Vladimir Kostyukov and Contributors.
 * 
 * This file is part of la4j project (http://la4j.org)
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * Contributor(s): -
 * 
 */

package org.la4j.matrix.sparse;

import org.la4j.matrix.Matrix;

public interface SparseMatrix extends Matrix {

    /**
     * Returns the number of non-zero elements of this matrix.
     * 
     * @return the number of non-zero elements of this matrix
     */
    int cardinality();

    /**
     * 
     * @return
     */
    double density();
}