aboutsummaryrefslogtreecommitdiffstats
path: root/src/main/java/com/softsynth/math/PolynomialTableData.java
diff options
context:
space:
mode:
Diffstat (limited to 'src/main/java/com/softsynth/math/PolynomialTableData.java')
-rw-r--r--src/main/java/com/softsynth/math/PolynomialTableData.java64
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);
+ }
+
+}