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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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 31x 31x 31x 2x 2x 2x 2x 2x | /**
* @license Apache-2.0
*
* Copyright (c) 2026 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 base = require( './base.js' );
// MAIN //
/**
* Solves a tridiagonal system of the form `A * X = B` using the `L * D * L^T` factorization of `A` computed by `dpttrf` and alternative indexing semantics.
*
* @param {NonNegativeInteger} N - order of the tridiagonal matrix `A`
* @param {NonNegativeInteger} nrhs - number of right-hand sides (i.e., the number of columns of the matrix `B`)
* @param {Float64Array} D - the `N` diagonal elements of the diagonal matrix `D` from the factorization of `A`
* @param {integer} sd - stride length for `D`
* @param {NonNegativeInteger} od - starting index for `D`
* @param {Float64Array} E - the `N-1` subdiagonal elements of the unit bidiagonal factor `L` from the factorization of `A`
* @param {integer} se - stride length for `E`
* @param {NonNegativeInteger} oe - starting index for `E`
* @param {Float64Array} B - input matrix (overwritten by the solution matrix `X`)
* @param {integer} sb1 - stride of the first dimension of `B`
* @param {integer} sb2 - stride of the second dimension of `B`
* @param {NonNegativeInteger} ob - starting index for `B`
* @returns {Float64Array} solution matrix `X` (stored in `B`)
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var D = new Float64Array( [ 4.0, 4.75, 5.157894736842105 ] );
* var E = new Float64Array( [ 0.25, 0.42105263157894735 ] );
* var B = new Float64Array( [ 1.0, 2.0, 3.0 ] );
*
* dptts2( 3, 1, D, 1, 0, E, 1, 0, B, 1, 3, 0 );
* // B => <Float64Array>[ ~0.2041, ~0.1837, ~0.4388 ]
*/
function dptts2( N, nrhs, D, sd, od, E, se, oe, B, sb1, sb2, ob ) { // eslint-disable-line max-params
return base( N, nrhs, D, sd, od, E, se, oe, B, sb1, sb2, ob );
}
// EXPORTS //
module.exports = dptts2;
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