function.java

来自「一个一元曲线多项式数值演示例子」· Java 代码 · 共 24 行

package numbercruncher.mathutils;

/**
 * The base class for functions that can have derivatives.
 */
public abstract class Function
    implements Evaluatable {
  /**
   * Return the value of the function at x.
   * (Implementation of Evaluatable.)
   * @param x the value of x
   * @return the function value
   */
  public abstract float at(float x);

  /**
   * Return the value of the function's derivative at x.
   * @param x the value of x
   * @return the derivative value
   */
  public float derivativeAt(float x) {
    return 0;
  }
}