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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 isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
var format = require( '@stdlib/string/format' );
var max = require( '@stdlib/math/base/special/fast/max' );
var ndarray = require( './ndarray.js' );
// MAIN //
/**
* Assigns elements from a strided vector to the anti-diagonal of a matrix.
*
* @param {string} order - storage layout
* @param {PositiveInteger} M - number of rows in `A`
* @param {PositiveInteger} N - number of columns in `A`
* @param {integer} k - starting index for the anti-diagonal
* @param {Collection} x - input vector
* @param {integer} strideX - stride length for `x`
* @param {Collection} A - input matrix
* @param {integer} LDA - stride of the first dimension of `A` (a.k.a., leading dimension of the matrix `A`)
* @throws {TypeError} first argument must be a valid order
* @throws {RangeError} eighth argument must be greater than or equal to max(1,M) for column-major or max(1,N) for row-major
* @returns {Collection} input matrix
*
* @example
* var A = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var x = [ 7.0, 8.0 ];
*
* gassignAntiDiagonal( 'row-major', 2, 3, 0, x, 1, A, 3 );
* // A => [ 1.0, 2.0, 7.0, 4.0, 8.0, 6.0 ]
*/
function gassignAntiDiagonal( order, M, N, k, x, strideX, A, LDA ) {
var strideA1;
var strideA2;
var s;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( isColumnMajor( order ) ) {
s = M;
strideA1 = 1;
strideA2 = LDA;
} else { // order === 'row-major'
s = N;
strideA1 = LDA;
strideA2 = 1;
}
if ( LDA < max( 1, s ) ) {
throw new RangeError( format( 'invalid argument. Eighth argument must be greater than or equal to max(1,%d). Value: `%d`.', s, LDA ) );
}
return ndarray( M, N, k, x, strideX, 0, A, strideA1, strideA2, 0 );
}
// EXPORTS //
module.exports = gassignAntiDiagonal;
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