text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2019 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' );
  var exp = require( '@stdlib/math-base-special-exp' );
  
  
  // MAIN //
  
  /**
  * Evaluates the standard logistic function.
  *
  * @param {number} x - input value
  * @returns {number} function value
  *
  * @example
  * var y = expit( 0.0 );
  * // returns 0.5
  *
  * @example
  * var y = expit( 1.0 );
  * // returns ~0.731
  *
  * @example
  * var y = expit( -1.0 );
  * // returns ~0.269
  *
  * @example
  * var y = expit( Infinity );
  * // returns 1.0
  *
  * @example
  * var y = expit( NaN );
  * // returns NaN
  */
  function expit( x ) {
  	if ( isnan( x ) ) {
  		return x;
  	}
  	return 1.0 / ( 1.0 + exp( -x ) );
  }
  
  
  // EXPORTS //
  
  module.exports = expit;
  