/**
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* @license
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* Copyright 2018 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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/// <amd-module name="@tensorflow/tfjs-core/dist/backends/complex_util" />
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import { TypedArray } from '../types';
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/**
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* Merges real and imaginary Float32Arrays into a single complex Float32Array.
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*
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* The memory layout is interleaved as follows:
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* real: [r0, r1, r2]
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* imag: [i0, i1, i2]
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* complex: [r0, i0, r1, i1, r2, i2]
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*
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* This is the inverse of splitRealAndImagArrays.
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*
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* @param real The real values of the complex tensor values.
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* @param imag The imag values of the complex tensor values.
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* @returns A complex tensor as a Float32Array with merged values.
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*/
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export declare function mergeRealAndImagArrays(real: Float32Array, imag: Float32Array): Float32Array;
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/**
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* Splits a complex Float32Array into real and imag parts.
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*
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* The memory layout is interleaved as follows:
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* complex: [r0, i0, r1, i1, r2, i2]
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* real: [r0, r1, r2]
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* imag: [i0, i1, i2]
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*
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* This is the inverse of mergeRealAndImagArrays.
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*
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* @param complex The complex tensor values.
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* @returns An object with real and imag Float32Array components of the complex
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* tensor.
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*/
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export declare function splitRealAndImagArrays(complex: Float32Array): {
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real: Float32Array;
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imag: Float32Array;
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};
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/**
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* Extracts even indexed complex values in the given array.
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* @param complex The complex tensor values
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*/
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export declare function complexWithEvenIndex(complex: Float32Array): {
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real: Float32Array;
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imag: Float32Array;
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};
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/**
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* Extracts odd indexed comple values in the given array.
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* @param complex The complex tensor values
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*/
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export declare function complexWithOddIndex(complex: Float32Array): {
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real: Float32Array;
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imag: Float32Array;
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};
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/**
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* Get the map representing a complex value in the given array.
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* @param complex The complex tensor values.
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* @param index An index of the target complex value.
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*/
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export declare function getComplexWithIndex(complex: Float32Array, index: number): {
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real: number;
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imag: number;
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};
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/**
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* Insert a given complex value into the TypedArray.
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* @param data The array in which the complex value is inserted.
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* @param c The complex value to be inserted.
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* @param index An index of the target complex value.
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*/
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export declare function assignToTypedArray(data: TypedArray, real: number, imag: number, index: number): void;
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/**
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* Make the list of exponent terms used by FFT.
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*/
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export declare function exponents(n: number, inverse: boolean): {
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real: Float32Array;
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imag: Float32Array;
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};
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/**
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* Make the exponent term used by FFT.
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*/
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export declare function exponent(k: number, n: number, inverse: boolean): {
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real: number;
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imag: number;
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};
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