001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.nabla.core; 018 019 /** Interface for differentiable univariate functions. 020 * <p>This interface should be implemented by the user 021 * classes that are intended to be differentiated by the 022 * Nabla library. It represent a simple function.</p> 023 * @see UnivariateDerivative 024 * @see UnivariateDifferentiator 025 */ 026 public interface UnivariateDifferentiable { 027 028 /** Simple mathematical function. 029 * <p>{@link UnivariateDifferentiable} classes compute only the 030 * value of the function, not its differential.</p> 031 * @param t function input value 032 * @return function result 033 */ 034 double f(double t); 035 036 }