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/*
 * Copyright (c) 2010-2024 Haifeng Li. All rights reserved.
 *
 * Smile is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Smile 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Smile.  If not, see .
 */

 package smile.util;
 
 /**
  * Represents a function that accepts an array element of double value
  * and produces a result.
  * 
  * @author Karl Li
  */
 public interface ArrayElementFunction {
     /**
      * Performs this operation on the given element.
      * 
      * @param i the index of array element.
      * @param x the value of array element.
    = * @return the function result.
      */
     double apply(int i, double x);
 }