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/*
* Copyright 1997 Phil Burk, Mobileer Inc
*
* 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.softsynth.math;
/**
* PolynomialTableData<br>
* Provides an array of double[] containing data generated by a polynomial.<br>
* This is typically used with ChebyshevPolynomial. Input to Polynomial is -1..1, output is -1..1.
*
* @author Nick Didkovsky (C) 1997 Phil Burk and Nick Didkovsky
* @see ChebyshevPolynomial
* @see Polynomial
*/
public class PolynomialTableData {
double[] data;
Polynomial polynomial;
/**
* Constructor which fills double[numFrames] with Polynomial data -1..1<br>
* Note that any Polynomial can plug in here, just make sure output is -1..1 when input ranges
* from -1..1
*/
public PolynomialTableData(Polynomial polynomial, int numFrames) {
data = new double[numFrames];
this.polynomial = polynomial;
buildData();
}
public double[] getData() {
return data;
}
void buildData() {
double xInterval = 2.0 / (data.length - 1); // FIXED, added "- 1"
double x;
for (int i = 0; i < data.length; i++) {
x = i * xInterval - 1.0;
data[i] = polynomial.evaluate(x);
// LOGGER.debug("x = " + x + ", p(x) = " + data[i] );
}
}
public static void main(String[] args) {
PolynomialTableData chebData = new PolynomialTableData(ChebyshevPolynomial.T(2), 8);
}
}
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