Java sin sin_core(double x)

Description

sicore

License

Apache License

Declaration

static public double sin_core(double x) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2011 See AUTHORS file.//w  w  w. j  a  v a 2s.  co  m
 * 
 * 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.
 ******************************************************************************/

public class Main {
    static public double sin_core(double x) {
        double x4, x2;
        x2 = x * x;
        x4 = x2 * x2;
        /* evaluate polynomial using a mix of Estrin's and Horner's scheme */
        return ((2.7181216275479732e-6 * x2 - 1.9839312269456257e-4) * x4
                + (8.3333293048425631e-3 * x2 - 1.6666666640797048e-1)) * x2 * x + x;
    }
}

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