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Java library with basic math stuff

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/**
 * Copyright (C) 2014-2020 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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 com.helger.numbercruncher.mathutils;

/**
 * Interface implemented by integrator classes.
 */
public interface IIntegrator
{
  /**
   * Integrate the function from a to b, and return an approximation to the
   * area.
   *
   * @param a
   *        the lower limit
   * @param b
   *        the upper limit
   * @param intervals
   *        the number of equal-width intervals
   * @return an approximation to the area
   */
  float integrate (float a, float b, int intervals);
}