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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.math.transform;
import org.apache.commons.math.FunctionEvaluationException;
import org.apache.commons.math.analysis.UnivariateRealFunction;
/**
* Interface for one-dimensional data sets transformations producing real results.
* <p>Such transforms include {@link FastSineTransformer sine transform},
* {@link FastCosineTransformer cosine transform} or {@link
* FastHadamardTransformer Hadamard transform}. {@link FastFourierTransformer
* Fourier transform} is of a different kind and does not implement this
* interface since it produces {@link org.apache.commons.math.complex.Complex complex}
* results instead of real ones.
* </p>
* @version $Revision: 1070725 $ $Date: 2011-02-15 02:31:12 +0100 (mar. 15 févr. 2011) $
* @since 2.0
*/
public interface RealTransformer {
/**
* Transform the given real data set.
* @param f the real data array to be transformed (signal)
* @return the real transformed array (spectrum)
* @throws IllegalArgumentException if any parameters are invalid
*/
double[] transform(double f[])
throws IllegalArgumentException;
/**
* Transform the given real function, sampled on the given interval.
* @param f the function to be sampled and transformed
* @param min the lower bound for the interval
* @param max the upper bound for the interval
* @param n the number of sample points
* @return the real transformed array
* @throws FunctionEvaluationException if function cannot be evaluated at some point
* @throws IllegalArgumentException if any parameters are invalid
*/
double[] transform(UnivariateRealFunction f, double min, double max, int n)
throws FunctionEvaluationException, IllegalArgumentException;
/**
* Inversely transform the given real data set.
* @param f the real data array to be inversely transformed (spectrum)
* @return the real inversely transformed array (signal)
* @throws IllegalArgumentException if any parameters are invalid
*/
double[] inversetransform(double f[])
throws IllegalArgumentException;
/**
* Inversely transform the given real function, sampled on the given interval.
* @param f the function to be sampled and inversely transformed
* @param min the lower bound for the interval
* @param max the upper bound for the interval
* @param n the number of sample points
* @return the real inversely transformed array
* @throws FunctionEvaluationException if function cannot be evaluated at some point
* @throws IllegalArgumentException if any parameters are invalid
*/
double[] inversetransform(UnivariateRealFunction f, double min, double max, int n)
throws FunctionEvaluationException, IllegalArgumentException;
}
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