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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';
/**
* Check for deflation, computes a shift (`TAU`) and calls DQDS. In case of failure it changes shifts, and tries again until output is positive.
*
* @module @stdlib/lapack/base/dlasq3
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var dlasq3 = require( '@stdlib/lapack/base/dlasq3' );
*
* var out = new Float64Array( 15 );
* var Z = new Float64Array( [ 100, 4, 81, 3, 64, 2.5, 49, 2, 36, 1.5, 25, 1, 16, 0.5, 9, 0 ] );
*
* dlasq3( 0, 3, Z, 0, true, out );
* // Z => <Float64Array>[ 100.0, 181.0, 81.0, ~28.641, 64.0, ~84.359, 49.0, ~20.911, ~36.0, ~40.089, 25.0, ~9.978, 16.0, ~6.022, 9.0, ~28.641 ]
* // out => <Float64Array>[ ~6.022, 0.0, 0.0, 0.0, 0.0, 1.0, 5.0, -1.0, ~15.089, ~35.359, ~6.022, 15.089, 35.359, 0.0, 0.0 ]
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var dlasq3 = require( '@stdlib/lapack/base/dlasq3' );
*
* var out = new Float64Array( 15 );
* var Z = new Float64Array( [ 100, 4, 81, 3, 64, 2.5, 49, 2, 36, 1.5, 25, 1, 16, 0.5, 9, 0 ] );
*
* dlasq3.ndarray( 0, 3, Z, 1, 0, 0, true, out, 1, 0 );
* // Z => <Float64Array>[ 100.0, 181.0, 81.0, ~28.641, 64.0, ~84.359, 49.0, ~20.911, ~36.0, ~40.089, 25.0, ~9.978, 16.0, ~6.022, 9.0, ~28.641 ]
* // out => <Float64Array>[ ~6.022, 0.0, 0.0, 0.0, 0.0, 1.0, 5.0, -1.0, ~15.089, ~35.359, ~6.022, 15.089, 35.359, 0.0, 0.0 ]
*/
// MODULES //
var join = require( 'path' ).join;
var tryRequire = require( '@stdlib/utils/try-require' );
var isError = require( '@stdlib/assert/is-error' );
var main = require( './main.js' );
// MAIN //
var dlasq3;
var tmp = tryRequire( join( __dirname, './native.js' ) );
if ( isError( tmp ) ) {
dlasq3 = main;
} else {
dlasq3 = tmp;
}
// EXPORTS //
module.exports = dlasq3;
// exports: { "ndarray": "dlasq3.ndarray" }
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