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* @license Apache-2.0
*
* Copyright (c) 2024 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 lnf = require( '@stdlib/math/base/special/lnf' );
var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
// MAIN //
/**
* Computes `x * ln(y)` so that the result is `0` if `x = 0` for single-precision floating-point numbers `x` and `y`.
*
* @param {number} x - input value
* @param {number} y - input value
* @returns {number} function value
*
* @example
* var out = xlogyf( 3.0, 2.0 );
* // returns ~2.079
*
* @example
* var out = xlogyf( 1.5, 5.9 );
* // returns ~2.662
*
* @example
* var out = xlogyf( 0.9, 1.0 );
* // returns 0.0
*
* @example
* var out = xlogyf( 0.0, -2.0 );
* // returns 0.0
*
* @example
* var out = xlogyf( 1.5, NaN );
* // returns NaN
*
* @example
* var out = xlogyf( 0.0, NaN );
* // returns NaN
*
* @example
* var out = xlogyf( NaN, 2.3 );
* // returns NaN
*/
function xlogyf( x, y ) {
if ( x === 0.0 && !isnanf( y ) ) {
return 0.0;
}
return float64ToFloat32( float64ToFloat32( x ) * lnf( float64ToFloat32( y ) ) );
}
// EXPORTS //
module.exports = xlogyf;
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