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 89x 89x 13x 13x 89x 13x 13x 63x 89x 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.
*/
/* eslint-disable max-len, max-params */
'use strict';
// MODULES //
var isMatrixTriangle = require( '@stdlib/blas/base/assert/is-matrix-triangle' );
var format = require( '@stdlib/string/format' );
var isNorm = require( './is_norm.js' );
var base = require( './base.js' );
// MAIN //
/**
* Computes the value of the one norm, Frobenius norm, infinity norm, or the element of largest absolute value of a real symmetric band matrix `A` using alternative indexing semantics.
*
* @param {string} norm - specifies the value to be returned
* @param {string} uplo - specifies whether the upper or lower triangular part of the band matrix `A` is supplied
* @param {NonNegativeInteger} N - order of the matrix `A`
* @param {NonNegativeInteger} K - number of super-/sub-diagonals of the band matrix `A`
* @param {Float64Array} AB - input band matrix stored in banded format
* @param {integer} strideAB1 - stride of the first dimension of `AB`
* @param {integer} strideAB2 - stride of the second dimension of `AB`
* @param {NonNegativeInteger} offsetAB - starting index for `AB`
* @param {Float64Array} work - workspace array (only referenced when computing the one or infinity norm)
* @param {integer} strideWork - stride length for `work`
* @param {NonNegativeInteger} offsetWork - starting index for `work`
* @throws {TypeError} first argument must be a valid norm
* @throws {TypeError} second argument must specify whether to reference the upper or lower triangular matrix
* @returns {number} norm value
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var AB = new Float64Array( [ 0.0, 1.0, 2.0, 3.0, 4.0, 5.0 ] );
* var work = new Float64Array( 3 );
*
* var out = dlansb( 'max', 'upper', 3, 1, AB, 1, 2, 0, work, 1, 0 );
* // returns 5.0
*/
function dlansb( norm, uplo, N, K, AB, strideAB1, strideAB2, offsetAB, work, strideWork, offsetWork ) {
if ( !isNorm( norm ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid norm. Value: `%s`.', norm ) );
}
if ( !isMatrixTriangle( uplo ) ) {
throw new TypeError( format( 'invalid argument. Second argument must specify whether to reference the upper or lower triangular matrix. Value: `%s`.', uplo ) );
}
return base( norm, uplo, N, K, AB, strideAB1, strideAB2, offsetAB, work, strideWork, offsetWork );
}
// EXPORTS //
module.exports = dlansb;
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