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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 serialize = require( '@stdlib/ndarray/base/serialize-meta-data' );
var getData = require( '@stdlib/ndarray/base/data-buffer' );
var addon = require( './../src/addon.node' );
// MAIN //
/**
* Copies the lower triangular part of a double-precision floating-point matrix `A` to another matrix `B`.
*
* ## Notes
*
* - The function expects the following ndarrays:
*
* - a two-dimensional input ndarray corresponding to `A`.
* - a two-dimensional output ndarray corresponding to `B`.
* - a zero-dimensional ndarray specifying the diagonal above which to ignore.
*
* @param {ArrayLikeObject<Object>} arrays - array-like object containing ndarrays
* @returns {Object} output ndarray
*
* @example
* var Float64Matrix = require( '@stdlib/ndarray/matrix/float64' );
* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
*
* var A = new Float64Matrix( [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] );
* var B = new Float64Matrix( [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] );
*
* var k = scalar2ndarray( 0, {
* 'dtype': 'int32'
* });
*
* var out = dtril( [ A, B, k ] );
* // returns <ndarray>[ [ 1.0, 0.0 ], [ 3.0, 4.0 ] ]
*
* var bool = ( out === B );
* // returns true
*/
function dtril( arrays ) {
var A = arrays[ 0 ];
var B = arrays[ 1 ];
var k = arrays[ 2 ];
addon( getData( A ), serialize( A ), getData( B ), serialize( B ), getData( k ), serialize( k ) ); // eslint-disable-line max-len
return B;
}
// EXPORTS //
module.exports = dtril;
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