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* @license Apache-2.0
*
* Copyright (c) 2025 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 isMatrixTriangle = require( '@stdlib/blas/base/assert/is-matrix-triangle' );
var isMatrixTranspose = require( '@stdlib/blas/base/assert/is-transpose-operation' );
var format = require( '@stdlib/string/format' );
var base = require( './base.js' );
// MAIN //
/**
* Performs one of the symmetric rank `2K` operations `C = α*A*B**T + C = α*B*A**T + β*C` or `C = α*A**T*B + α*B**T*A + β*C` where `α` and `β` are scalars, `C` is an `N` by `N` symmetric matrix and `A` and `B` are `N` by `K` matrices in the first case and `K` by `N` matrices in the second case.
*
* @private
* @param {string} uplo - specifies whether the upper or lower triangular part of the symmetric matrix `C` is supplied
* @param {string} trans - specifies whether `A` should be transposed, conjugate-transposed, or not transposed
* @param {NonNegativeInteger} N - order of the matrix `C`
* @param {NonNegativeInteger} K - number of columns or number of rows of the matrices `A` and `B`
* @param {number} alpha - scalar constant
* @param {Float64Array} A - first matrix
* @param {integer} strideA1 - stride of the first dimension of `A`
* @param {integer} strideA2 - stride of the second dimension of `A`
* @param {NonNegativeInteger} offsetA - starting index for `A`
* @param {Float64Array} B - second 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`
* @param {number} beta - scalar constant
* @param {Float64Array} C - third matrix
* @param {integer} strideC1 - stride of the first dimension of `C`
* @param {integer} strideC2 - stride of the second dimension of `C`
* @param {NonNegativeInteger} offsetC - starting index for `C`
* @throws {TypeError} first argument must be a valid side
* @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} fourth argument must be a nonnegative integer
* @throws {RangeError} sixteenth argument must be non-zero
* @throws {RangeError} seventeenth argument must be non-zero
* @returns {Float64Array} `C`
*
* var Float64Array = require( '@stdlib/array/float64' );
*
* var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 ] );
* var B = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 ] );
* var C = new Float64Array( [ 1.0, 2.0, 3.0, 0.0, 4.0, 5.0, 0.0, 0.0, 6.0 ] );
*
* dsyr2k( 'upper', 'no-transpose', 3, 3, 1.0, A, 3, 1, 0, B, 3, 1, 0, 1.0, C, 3, 1, 0 );
* // C => <Float64Array>[ 29.0, 66.0, 103.0, 0.0, 158.0, 249.0, 0.0, 0.0, 394.0 ]
*/
function dsyr2k( uplo, trans, N, K, alpha, A, strideA1, strideA2, offsetA, B, strideB1, strideB2, offsetB, beta, C, strideC1, strideC2, offsetC ) { // eslint-disable-line max-params, max-len
if ( !isMatrixTriangle( uplo ) ) {
throw new TypeError( format( 'invalid argument. First argument must specify whether the lower or upper triangular matrix is supplied. Value: `%s`.', uplo ) );
}
if ( !isMatrixTranspose( trans ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a valid transpose operation. Value: `%s`.', trans ) );
}
if ( N < 0 ) {
throw new RangeError( format( 'invalid argument. Third argument must be a nonnegative integer. Value: `%d`.', N ) );
}
if ( K < 0 ) {
throw new RangeError( format( 'invalid argument. Fourth argument must be a nonnegative integer. Value: `%d`.', K ) );
}
if ( strideC1 === 0 ) {
throw new RangeError( format( 'invalid argument. Sixteenth argument must be non-zero. Value: `%d`.', strideC1 ) );
}
if ( strideC2 === 0 ) {
throw new RangeError( format( 'invalid argument. Seventeenth argument must be non-zero. Value: `%d`.', strideC2 ) );
}
return base( uplo, trans, N, K, alpha, A, strideA1, strideA2, offsetA, B, strideB1, strideB2, offsetB, beta, C, strideC1, strideC2, offsetC ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = dsyr2k;
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