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Formatting (MATH-677). 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1208942 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Sebastien Brisard 2011-12-01 03:37:02 +00:00
parent 31d0c4eff6
commit 5e2504bbb2
1 changed files with 14 additions and 14 deletions
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28
src/main/java/org/apache/commons/math/transform/FastCosineTransformer.java
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@ -57,7 +57,7 @@ public class FastCosineTransformer implements RealTransformer {
* @return the real transformed array * @return the real transformed array
* @throws IllegalArgumentException if any parameters are invalid * @throws IllegalArgumentException if any parameters are invalid
*/ */
public double[] transform(double f[]) throws IllegalArgumentException { public double[] transform(double[] f) throws IllegalArgumentException {
return fct(f); return fct(f);
} }
@ -78,7 +78,7 @@ public class FastCosineTransformer implements RealTransformer {
public double[] transform(UnivariateFunction f, public double[] transform(UnivariateFunction f,
double min, double max, int n) double min, double max, int n)
throws IllegalArgumentException { throws IllegalArgumentException {
double data[] = FastFourierTransformer.sample(f, min, max, n); double[] data = FastFourierTransformer.sample(f, min, max, n);
return fct(data); return fct(data);
} }
@ -93,7 +93,7 @@ public class FastCosineTransformer implements RealTransformer {
* @return the real transformed array * @return the real transformed array
* @throws IllegalArgumentException if any parameters are invalid * @throws IllegalArgumentException if any parameters are invalid
*/ */
public double[] transform2(double f[]) throws IllegalArgumentException { public double[] transform2(double[] f) throws IllegalArgumentException {
double scalingCoefficient = FastMath.sqrt(2.0 / (f.length - 1)); double scalingCoefficient = FastMath.sqrt(2.0 / (f.length - 1));
return FastFourierTransformer.scaleArray(fct(f), scalingCoefficient); return FastFourierTransformer.scaleArray(fct(f), scalingCoefficient);
@ -118,7 +118,7 @@ public class FastCosineTransformer implements RealTransformer {
double min, double max, int n) double min, double max, int n)
throws IllegalArgumentException { throws IllegalArgumentException {
double data[] = FastFourierTransformer.sample(f, min, max, n); double[] data = FastFourierTransformer.sample(f, min, max, n);
double scalingCoefficient = FastMath.sqrt(2.0 / (n - 1)); double scalingCoefficient = FastMath.sqrt(2.0 / (n - 1));
return FastFourierTransformer.scaleArray(fct(data), scalingCoefficient); return FastFourierTransformer.scaleArray(fct(data), scalingCoefficient);
} }
@ -134,7 +134,7 @@ public class FastCosineTransformer implements RealTransformer {
* @return the real inversely transformed array * @return the real inversely transformed array
* @throws IllegalArgumentException if any parameters are invalid * @throws IllegalArgumentException if any parameters are invalid
*/ */
public double[] inverseTransform(double f[]) public double[] inverseTransform(double[] f)
throws IllegalArgumentException { throws IllegalArgumentException {
double scalingCoefficient = 2.0 / (f.length - 1); double scalingCoefficient = 2.0 / (f.length - 1);
@ -160,7 +160,7 @@ public class FastCosineTransformer implements RealTransformer {
double min, double max, int n) double min, double max, int n)
throws IllegalArgumentException { throws IllegalArgumentException {
double data[] = FastFourierTransformer.sample(f, min, max, n); double[] data = FastFourierTransformer.sample(f, min, max, n);
double scalingCoefficient = 2.0 / (n - 1); double scalingCoefficient = 2.0 / (n - 1);
return FastFourierTransformer.scaleArray(fct(data), scalingCoefficient); return FastFourierTransformer.scaleArray(fct(data), scalingCoefficient);
} }
@ -176,7 +176,7 @@ public class FastCosineTransformer implements RealTransformer {
* @return the real inversely transformed array * @return the real inversely transformed array
* @throws IllegalArgumentException if any parameters are invalid * @throws IllegalArgumentException if any parameters are invalid
*/ */
public double[] inverseTransform2(double f[]) public double[] inverseTransform2(double[] f)
throws IllegalArgumentException { throws IllegalArgumentException {
return transform2(f); return transform2(f);
} }
@ -210,10 +210,10 @@ public class FastCosineTransformer implements RealTransformer {
* @return the real transformed array * @return the real transformed array
* @throws IllegalArgumentException if any parameters are invalid * @throws IllegalArgumentException if any parameters are invalid
*/ */
protected double[] fct(double f[]) protected double[] fct(double[] f)
throws IllegalArgumentException { throws IllegalArgumentException {
final double transformed[] = new double[f.length]; final double[] transformed = new double[f.length];
final int n = f.length - 1; final int n = f.length - 1;
if (!FastFourierTransformer.isPowerOf2(n)) { if (!FastFourierTransformer.isPowerOf2(n)) {
@ -234,15 +234,15 @@ public class FastCosineTransformer implements RealTransformer {
// temporary variable for transformed[1] // temporary variable for transformed[1]
double t1 = 0.5 * (f[0] - f[n]); double t1 = 0.5 * (f[0] - f[n]);
for (int i = 1; i < (n >> 1); i++) { for (int i = 1; i < (n >> 1); i++) {
final double a = 0.5 * (f[i] + f[n-i]); final double a = 0.5 * (f[i] + f[n - i]);
final double b = FastMath.sin(i * FastMath.PI / n) * (f[i] - f[n-i]); final double b = FastMath.sin(i * FastMath.PI / n) * (f[i] - f[n - i]);
final double c = FastMath.cos(i * FastMath.PI / n) * (f[i] - f[n-i]); final double c = FastMath.cos(i * FastMath.PI / n) * (f[i] - f[n - i]);
x[i] = a - b; x[i] = a - b;
x[n-i] = a + b; x[n - i] = a + b;
t1 += c; t1 += c;
} }
FastFourierTransformer transformer = new FastFourierTransformer(); FastFourierTransformer transformer = new FastFourierTransformer();
Complex y[] = transformer.transform(x); Complex[] y = transformer.transform(x);
// reconstruct the FCT result for the original array // reconstruct the FCT result for the original array
transformed[0] = y[0].getReal(); transformed[0] = y[0].getReal();