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Open Source Chemistry Library
/*******************************************************************************
* Copyright (c) 2010 Haifeng Li
*
* 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.
*******************************************************************************/
package smile.math.distance;
/**
* A metric function defines a distance between elements of a set. Besides
* non-negativity, isolation, and symmetry, it also has to satisfy triangular
* inequality.
*
* - non-negativity: d(x, y) ≥ 0
*
- isolation: d(x, y) = 0 if and only if x = y
*
- symmetry: d(x, y) = d(x, y)
*
- triangular inequality: d(x, y) + d(y, z) ≥ d(x, z).
*
.
*
* @author Haifeng Li
*/
public interface Metric extends Distance {
}