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Java example source code file (RealTransformer.java)

This example Java source code file (RealTransformer.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

mathillegalargumentexception, nonmonotonicsequenceexception, notstrictlypositiveexception, realtransformer, transformtype

The RealTransformer.java Java example source code

/*
 * 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.math3.transform;

import org.apache.commons.math3.analysis.UnivariateFunction;
import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.exception.NonMonotonicSequenceException;
import org.apache.commons.math3.exception.NotStrictlyPositiveException;

/**
 * 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.math3.complex.Complex}
 * results instead of real ones.
 *
 * @since 2.0
 */
public interface RealTransformer  {

    /**
     * Returns the (forward, inverse) transform of the specified real data set.
     *
     * @param f the real data array to be transformed (signal)
     * @param type the type of transform (forward, inverse) to be performed
     * @return the real transformed array (spectrum)
     * @throws MathIllegalArgumentException if the array cannot be transformed
     *   with the given type (this may be for example due to array size, which is
     *   constrained in some transforms)
     */
    double[] transform(double[] f, TransformType type) throws MathIllegalArgumentException;

    /**
     * Returns the (forward, inverse) transform of the specified real function,
     * sampled on the specified interval.
     *
     * @param f the function to be sampled and transformed
     * @param min the (inclusive) lower bound for the interval
     * @param max the (exclusive) upper bound for the interval
     * @param n the number of sample points
     * @param type the type of transform (forward, inverse) to be performed
     * @return the real transformed array
     * @throws NonMonotonicSequenceException if the lower bound is greater than, or equal to the upper bound
     * @throws NotStrictlyPositiveException if the number of sample points is negative
     * @throws MathIllegalArgumentException if the sample cannot be transformed
     *   with the given type (this may be for example due to sample size, which is
     *   constrained in some transforms)
     */
    double[] transform(UnivariateFunction f, double min, double max, int n,
                       TransformType type)
        throws NonMonotonicSequenceException, NotStrictlyPositiveException, MathIllegalArgumentException;

}

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