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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 dlaisnan = require( '@stdlib/lapack/base/dlaisnan' );
// MAIN //
/**
* Tests a double-precision floating-point numeric value for NaN.
*
* ## Notes
*
* - This routine uses `dlaisnan` to test for `NaN` by comparing the argument against itself for inequality.
*
* @param {number} din - double-precision floating-point number to test
* @returns {boolean} boolean indicating whether the value is NaN
*
* @example
* var bool = disnan( NaN );
* // returns true
*
* @example
* var bool = disnan( 5.0 );
* // returns false
*/
function disnan( din ) {
return dlaisnan( din, din );
}
// EXPORTS //
module.exports = disnan;
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