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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 isLayout = require( '@stdlib/blas/base/assert/is-layout' );
var format = require( '@stdlib/string/format' );
var base = require( './base.js' );
// VARIABLES //
var NORMS = [ 'M', 'm', '1', 'O', 'o', 'I', 'i', 'F', 'f', 'E', 'e' ];
var UPLOS = [ 'upper', 'lower' ];
// MAIN //
/**
* Returns the value of the one-norm, Frobenius norm, infinity-norm, or the largest absolute value of any element of a real symmetric matrix `AP` supplied in packed form.
*
* @param {string} order - storage layout of `AP`
* @param {string} norm - specifies the norm type
* @param {string} uplo - specifies whether the upper or lower triangular part of `A` is referenced
* @param {NonNegativeInteger} N - order of the matrix `A`
* @param {Float64Array} AP - packed form of a symmetric matrix `A`
* @throws {TypeError} first argument must be a valid order
* @throws {TypeError} second argument must be a valid norm type
* @throws {TypeError} third argument must be a valid uplo value
* @returns {number} matrix norm
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* // AP = [ 1.0, 2.0, 5.0 ] (2x2 symmetric packed column-major upper)
* var AP = new Float64Array( [ 1.0, 2.0, 5.0 ] );
*
* var norm = dlansp( 'column-major', 'M', 'upper', 2, AP );
* // returns 5.0
*/
function dlansp( order, norm, uplo, N, AP ) {
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( NORMS.indexOf( norm ) === -1 ) {
throw new TypeError( format( 'invalid argument. Second argument must be a valid norm type. Value: `%s`.', norm ) );
}
if ( UPLOS.indexOf( uplo ) === -1 ) {
throw new TypeError( format( 'invalid argument. Third argument must be a valid uplo value. Value: `%s`.', uplo ) );
}
return base( order, norm, uplo, N, AP, 1, 0 );
}
// EXPORTS //
module.exports = dlansp;
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