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 * The ASF licenses this file to You 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
 *
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package org.apache.commons.math3.linear;

Marker interface for RealMatrix implementations that require sparse backing storage 
 Caveat: Implementation are allowed to assume that, for any x, the equality x * 0d == 0d holds. But it is is not true for NaN. Moreover, zero entries will lose their sign. Some operations (that involve NaN and/or infinities) may thus give incorrect results. 
Since:
2.0/**
 * Marker interface for {@link RealMatrix} implementations that require sparse backing storage
 *
 * <p>
 *  Caveat: Implementation are allowed to assume that, for any {@code x},
 *  the equality {@code x * 0d == 0d} holds. But it is is not true for
 *  {@code NaN}. Moreover, zero entries will lose their sign.
 *  Some operations (that involve {@code NaN} and/or infinities) may
 *  thus give incorrect results.
 * </p>
 * @since 2.0
 */
public interface SparseRealMatrix extends RealMatrix {

}