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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 isnan = require( '@stdlib/math/base/assert/is-nan' );
 
 
// MAIN //
 
/**
* Returns the mode for a double Weibull distribution with shape parameter `c`.
*
* @param {PositiveNumber} c - shape parameter
* @returns {Number} mode
*
* @example
* var v = mode( 1.0 );
* // returns 0.0
*
* @example
* var v = mode( 4.0 );
* // returns 0.0
*
* @example
* var v = mode( 8.0 );
* // returns 0.0
*
* @example
* var v = mode( -0.1 );
* // returns NaN
*
* @example
* var v = mode( NaN );
* // returns NaN
*/
function mode( c ) {
	if (
		isnan( c ) ||
		c <= 0.0
	) {
		return NaN;
	}
	return 0.0;
}
 
 
// EXPORTS //
 
module.exports = mode;