Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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';
/**
* Compute an approximation to the smallest eigenvalue using values of d from the previous transform.
*
* ## Notes
*
* - Z is a 1-D array of length >= 4*N0 storing interleaved q/e values.
* - PP is 0 for ping, 1 for pong.
* - TAU is an approximation to the smallest eigenvalue and is used as a shift to accelerate convergence of the dqds iteration.
* - TTYPE is an integer flag describing how TAU was computed.
* - G is a state variable that is preserved across successive calls and is used to regulate the magnitude of fallback shifts.
*
* @module @stdlib/lapack/base/dlasq4
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var dlasq4 = require( '@stdlib/lapack/base/dlasq4' );
*
* var out = new Float64Array( 3 );
* var Z = new Float64Array( [ 5, 0, 7, 0, 9, 0, 3, 0, 10, 0, 4.5, 0, 18, 0, 0, 0 ] );
*
* dlasq4( 0, 3, Z, 0, 3, 0.2, 0.15, 0.1, 0.8, 0.7, 0.6, -6, out );
* // out => <Float64Array>[ ~0.05, -6, 0.25 ]
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var dlasq4 = require( '@stdlib/lapack/base/dlasq4' );
*
* var out = new Float64Array( 3 );
* var Z = new Float64Array( [ 5, 0, 7, 0, 9, 0, 3, 0, 10, 0, 4.5, 0, 18, 0, 0, 0 ] );
*
* dlasq4.ndarray( 0, 3, Z, 1, 0, 0, 3, 0.2, 0.15, 0.1, 0.8, 0.7, 0.6, -6, out, 1, 0 );
* // out => <Float64Array>[ ~0.05, -6, 0.25 ]
*/
// 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 dlasq4;
var tmp = tryRequire( join( __dirname, './native.js' ) );
if ( isError( tmp ) ) {
dlasq4 = main;
} else {
dlasq4 = tmp;
}
// EXPORTS //
module.exports = dlasq4;
// exports: { "ndarray": "dlasq4.ndarray" }
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