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author | Karl Shaffer <karlshaffer@google.com> | 2023-08-10 22:35:48 +0000 |
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committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | 2023-08-10 22:35:48 +0000 |
commit | 5484895ffd3d0c8337d159667cafc127c459f677 (patch) | |
tree | ace24ba4307d4978ee3134f7da671a77ad172da0 /src/main/java/org/apache/commons/math3/transform/RealTransformer.java | |
parent | bbf9548f049f99fd8e5a593baae983532dd983f4 (diff) | |
parent | b3715644fba79ef08acd9a2e157d078865281767 (diff) | |
download | apache-commons-math-5484895ffd3d0c8337d159667cafc127c459f677.tar.gz |
Check-in commons-math 3.6.1 am: 1354beaf45 am: 0018f64b87 am: b3715644fb
Original change: https://android-review.googlesource.com/c/platform/external/apache-commons-math/+/2702413
Change-Id: I5ad9b2a0822d668b5b6a62933c6d4c1f0b802001
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
Diffstat (limited to 'src/main/java/org/apache/commons/math3/transform/RealTransformer.java')
-rw-r--r-- | src/main/java/org/apache/commons/math3/transform/RealTransformer.java | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math3/transform/RealTransformer.java b/src/main/java/org/apache/commons/math3/transform/RealTransformer.java new file mode 100644 index 0000000..b5a105b --- /dev/null +++ b/src/main/java/org/apache/commons/math3/transform/RealTransformer.java @@ -0,0 +1,68 @@ +/* + * 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; +} |