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* @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 //
/**
* Performs a matrix-matrix product of the form `B := alpha * A * X + beta * B` where `A` is a tridiagonal matrix, `B` and `X` are N by NRHS matrices, and `alpha` and `beta` are real scalars, each of which may be `0`, `1`, or `-1`, using alternative indexing semantics.
*
* @param {string} trans - specifies the operation applied to `A`
* @param {NonNegativeInteger} N - order of the matrix `A`
* @param {NonNegativeInteger} NRHS - number of right hand sides (columns of `X` and `B`)
* @param {number} alpha - scalar alpha
* @param {Float64Array} DL - sub-diagonal of `A`
* @param {integer} strideDL - stride length for `DL`
* @param {NonNegativeInteger} offsetDL - starting index of `DL`
* @param {Float64Array} D - diagonal of `A`
* @param {integer} strideD - stride length for `D`
* @param {NonNegativeInteger} offsetD - starting index of `D`
* @param {Float64Array} DU - super-diagonal of `A`
* @param {integer} strideDU - stride length for `DU`
* @param {NonNegativeInteger} offsetDU - starting index of `DU`
* @param {Float64Array} X - input matrix `X`
* @param {integer} strideX1 - stride of the first dimension of `X`
* @param {integer} strideX2 - stride of the second dimension of `X`
* @param {NonNegativeInteger} offsetX - starting index of `X`
* @param {number} beta - scalar beta
* @param {Float64Array} B - input/output matrix `B`
* @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 of `B`
* @returns {Float64Array} `B`
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var DL = new Float64Array( [ 1.0, 1.0 ] );
* var D = new Float64Array( [ 2.0, 3.0, 4.0 ] );
* var DU = new Float64Array( [ 1.0, 1.0 ] );
* var X = new Float64Array( [ 1.0, 1.0, 1.0 ] );
* var B = new Float64Array( [ 0.0, 0.0, 0.0 ] );
*
* dlagtm( 'no-transpose', 3, 1, 1.0, DL, 1, 0, D, 1, 0, DU, 1, 0, X, 1, 3, 0, 0.0, B, 1, 3, 0 );
* // B => <Float64Array>[ 3.0, 5.0, 5.0 ]
*/
function dlagtm( trans, N, NRHS, alpha, DL, strideDL, offsetDL, D, strideD, offsetD, DU, strideDU, offsetDU, X, strideX1, strideX2, offsetX, beta, B, strideB1, strideB2, offsetB ) { // eslint-disable-line max-len, max-params
return base( trans, N, NRHS, alpha, DL, strideDL, offsetDL, D, strideD, offsetD, DU, strideDU, offsetDU, X, strideX1, strideX2, offsetX, beta, B, strideB1, strideB2, offsetB ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = dlagtm;
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