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* @license Apache-2.0
*
* Copyright (c) 2025 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 isNegativeIntegerf = require( '@stdlib/math/base/assert/is-negative-integerf' );
var absgammalnf = require( '@stdlib/math/base/special/absgammalnf' );
var f32 = require( '@stdlib/number/float64/base/to-float32' );
// VARIABLES //
var ONE = f32( 1.0 );
// MAIN //
/**
* Evaluates the natural logarithm of the factorial of a single-precision floating-point number.
*
* @param {number} x - input value
* @returns {number} natural logarithm of factorial of `x`
*
* @example
* var v = factoriallnf( 3.0 );
* // returns ~1.792
*
* @example
* var v = factoriallnf( 2.4 );
* // returns ~1.092
*
* @example
* var v = factoriallnf( -1.0 );
* // returns NaN
*
* @example
* var v = factoriallnf( -1.5 );
* // returns ~1.266
*
* @example
* var v = factoriallnf( NaN );
* // returns NaN
*/
function factoriallnf( x ) {
x = f32( x );
if ( isNegativeIntegerf( x ) ) {
return NaN;
}
return absgammalnf( f32( x + ONE ) );
}
// EXPORTS //
module.exports = factoriallnf;
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