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Diffstat (limited to 'src/main/java/com/softsynth/math/PolynomialTableData.java')
-rw-r--r-- | src/main/java/com/softsynth/math/PolynomialTableData.java | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/main/java/com/softsynth/math/PolynomialTableData.java b/src/main/java/com/softsynth/math/PolynomialTableData.java new file mode 100644 index 0000000..8110151 --- /dev/null +++ b/src/main/java/com/softsynth/math/PolynomialTableData.java @@ -0,0 +1,64 @@ +/* + * 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); + } + +} |