Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | 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 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 21x 21x 21x 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 system of linear equations `A * X = B`, where `A` is an `N`-by-`N` tridiagonal matrix, using Gaussian elimination with partial pivoting and alternative indexing semantics.
*
* ## Notes
*
* - `DL` should have `N-1` indexed elements and is overwritten by the `(N-2)` elements of the second super-diagonal of the upper triangular matrix `U` from the `LU` factorization of `A`.
* - `D` should have `N` indexed elements and is overwritten by the `N` diagonal elements of `U`.
* - `DU` should have `N-1` indexed elements and is overwritten by the `(N-1)` elements of the first super-diagonal of `U`.
* - `B` is an `N`-by-`NRHS` matrix and, if the returned status code is `0`, is overwritten by the solution matrix `X`.
*
* @param {NonNegativeInteger} N - number of rows/columns in `A`
* @param {NonNegativeInteger} NRHS - number of right-hand sides (i.e., number of columns in `B`)
* @param {Float64Array} DL - the first sub-diagonal of `A`
* @param {integer} strideDL - stride length for `DL`
* @param {NonNegativeInteger} offsetDL - starting index for `DL`
* @param {Float64Array} D - the diagonal of `A`
* @param {integer} strideD - stride length for `D`
* @param {NonNegativeInteger} offsetD - starting index for `D`
* @param {Float64Array} DU - the first super-diagonal of `A`
* @param {integer} strideDU - stride length for `DU`
* @param {NonNegativeInteger} offsetDU - starting index for `DU`
* @param {Float64Array} B - input matrix
* @param {integer} strideB1 - stride of the first dimension of `B`
* @param {integer} strideB2 - stride of the second dimension of `B`
* @param {NonNegativeInteger} offsetB - starting index for `B`
* @returns {integer} status code
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var DL = new Float64Array( [ 1.0, 1.0 ] );
* var D = new Float64Array( [ 2.0, 3.0, 1.0 ] );
* var DU = new Float64Array( [ 1.0, 1.0 ] );
* var B = new Float64Array( [ 4.0, 10.0, 5.0 ] );
*
* dgtsv( 3, 1, DL, 1, 0, D, 1, 0, DU, 1, 0, B, 1, 3, 0 );
* // B => <Float64Array>[ 1.0, 2.0, 3.0 ]
*/
function dgtsv( N, NRHS, DL, strideDL, offsetDL, D, strideD, offsetD, DU, strideDU, offsetDU, B, strideB1, strideB2, offsetB ) { // eslint-disable-line stdlib/jsdoc-doctest-decimal-point, max-len, max-params
return base( N, NRHS, DL, strideDL, offsetDL, D, strideD, offsetD, DU, strideDU, offsetDU, B, strideB1, strideB2, offsetB ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = dgtsv;
|