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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 isnanf = require( '@stdlib/math/base/assert/is-nanf' );
var expm1f = require( '@stdlib/math/base/special/expm1f' );
var expf = require( '@stdlib/math/base/special/expf' );
var log1pf = require( '@stdlib/math/base/special/log1pf' );
var lnf = require( '@stdlib/math/base/special/lnf' );
var absf = require( '@stdlib/math/base/special/absf' );
var f32 = require( '@stdlib/number/float64/base/to-float32' );
var LN2 = require( '@stdlib/constants/float32/ln-two' );
var NINF = require( '@stdlib/constants/float32/ninf' );
// MAIN //
/**
* Computes the natural logarithm of `1-exp(-|x|)` for a single-precision floating-point number.
*
* @param {number} x - input value
* @returns {number} function value
*
* @example
* var v = log1mexpf( 1.1 );
* // returns ~-0.40477
*
* @example
* var v = log1mexpf( 0.0 );
* // returns -Infinity
*
* @example
* var v = log1mexpf( NaN );
* // returns NaN
*/
function log1mexpf( x ) {
var ax;
x = f32( x );
if ( isnanf( x ) ) {
return NaN;
}
if ( x === 0.0 ) {
return NINF;
}
ax = absf( x );
if ( 0.0 < ax && ax <= LN2 ) {
return lnf( f32( -expm1f( f32( -ax ) ) ) );
}
// Case: |x| > ln(2)
return log1pf( f32( -expf( f32( -ax ) ) ) );
}
// EXPORTS //
module.exports = log1mexpf;
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