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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 6x 26x 20x 20x 26x 26x 2x 2x 2x 2x 26x 24x 24x 24x 24x 24x 24x 6x 24x 16x 16x 24x 26x 26x 26x 26x 26x 26x 26x 26x 3x 3x 3x 3x 3x | /** * @license Apache-2.0 * * Copyright (c) 2023 The Stdlib Authors. * * Licensed 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. */ 'use strict'; // MODULES // var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' ); var absf = require( '@stdlib/math/base/special/absf' ); var sqrtf = require( '@stdlib/math/base/special/sqrtf' ); var abs2f = require( '@stdlib/math/base/special/abs2f' ); var copysignf = require( '@stdlib/math/base/special/copysignf' ); // MAIN // /** * Constructs a Givens plane rotation using alternative indexing semantics. * * @param {number} a - rotational elimination parameter * @param {number} b - rotational elimination parameter * @param {Float32Array} out - output array * @param {integer} strideOut - stride length for `Out` * @param {NonNegativeInteger} offsetOut - starting index for `Out` * @returns {Float32Array} output array * * @example * var Float32Array = require( '@stdlib/array/float32' ); * * var out = srotg( 0.0, 2.0, new Float32Array( 4 ), 1, 0 ); * // returns <Float32Array>[ 2.0, 1.0, 0.0, 1.0 ] */ function srotg( a, b, out, strideOut, offsetOut ) { var scale; var sign; var aa; var ab; var r; var c; var s; var z; aa = absf( a ); ab = absf( b ); if ( aa > ab ) { sign = copysignf( 1.0, a ); } else { sign = copysignf( 1.0, b ); } scale = float64ToFloat32( aa + ab ); if ( scale === 0.0 ) { c = 1.0; s = 0.0; r = 0.0; z = 0.0; } else { r = float64ToFloat32( scale * sqrtf( float64ToFloat32( abs2f( float64ToFloat32( a/scale ) ) + abs2f( float64ToFloat32( b/scale ) ) ) ) ); // eslint-disable-line max-len r = float64ToFloat32( r * sign ); c = float64ToFloat32( a / r ); s = float64ToFloat32( b / r ); z = 1.0; if ( aa > ab ) { z = s; } else if ( c !== 0.0 ) { z = float64ToFloat32( 1.0 / c ); } } a = r; b = z; out[ offsetOut ] = a; out[ offsetOut + strideOut ] = b; out[ offsetOut + ( 2 * strideOut ) ] = c; out[ offsetOut + ( 3 * strideOut ) ] = s; return out; } // EXPORTS // module.exports = srotg; |