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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 resolveStr = require( '@stdlib/blas/base/matrix-triangle-resolve-str' );
var format = require( '@stdlib/string/format' );
var base = require( './base.js' );
// MAIN //
/**
* Performs the matrix-vector operation `y = alpha*A*x + beta*y` where `alpha` and `beta` are scalars, `x` and `y` are `N` element vectors, and `A` is an `N` by `N` symmetric matrix supplied in packed form, using alternative indexing semantics.
*
* @param {string} order - storage layout
* @param {(integer|string)} uplo - specifies whether the upper or lower triangular part of the symmetric matrix `A` is supplied
* @param {NonNegativeInteger} N - number of elements along each dimension of `A`
* @param {number} alpha - scalar constant
* @param {NumericArray} AP - packed form of a symmetric matrix `A`
* @param {NonNegativeInteger} offsetAP - starting index for `AP`
* @param {NumericArray} x - first input vector
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {number} beta - scalar constant
* @param {NumericArray} y - second input vector
* @param {integer} strideY - `y` stride length
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @throws {TypeError} first argument must be a valid order
* @throws {TypeError} second argument must specify whether the lower or upper triangular matrix is supplied
* @throws {RangeError} third argument must be a nonnegative integer
* @throws {RangeError} eighth argument must be non-zero
* @throws {RangeError} twelfth argument must be non-zero
* @returns {NumericArray} `y`
*
* @example
* var AP = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var x = [ 1.0, 1.0, 1.0 ];
* var y = [ 1.0, 1.0, 1.0 ];
*
* gspmv( 'column-major', 'lower', 3, 1.0, AP, 0, x, 1, 0, 1.0, y, 1, 0 );
* // y => [ 7.0, 12.0, 15.0 ]
*/
function gspmv( order, uplo, N, alpha, AP, offsetAP, x, strideX, offsetX, beta, y, strideY, offsetY ) { // eslint-disable-line max-params, max-len
var u;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
u = resolveStr( uplo );
if ( u === null ) {
throw new TypeError( format( 'invalid argument. Second argument must specify whether the lower or upper triangular matrix is supplied. Value: `%s`.', uplo ) );
}
if ( N < 0 ) {
throw new RangeError( format( 'invalid argument. Third argument must be a nonnegative integer. Value: `%d`.', N ) );
}
if ( strideX === 0 ) {
throw new RangeError( format( 'invalid argument. Eighth argument must be non-zero. Value: `%d`.', strideX ) );
}
if ( strideY === 0 ) {
throw new RangeError( format( 'invalid argument. Twelfth argument must be non-zero. Value: `%d`.', strideY ) );
}
return base( order, u, N, alpha, AP, offsetAP, x, strideX, offsetX, beta, y, strideY, offsetY ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = gspmv;
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