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Compute the standard logistic function.
The standard logistic function, also called the expit function, inverse logit, or sigmoid function, is defined as the logistic function with parameters (k = 1, x0 = 0, L = 1).
npm install @stdlib/math-base-special-expitvar expit = require( '@stdlib/math-base-special-expit' );Computes the standard logistic function.
var v = expit( 0.0 );
// returns ~0.5
v = expit( 1.0 );
// returns ~0.731
v = expit( -1.0 );
// returns ~0.269
v = expit( Infinity );
// returns 1.0
v = expit( NaN );
// returns NaNvar randu = require( '@stdlib/random-base-randu' );
var expit = require( '@stdlib/math-base-special-expit' );
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = randu();
console.log( 'expit(%d) = %d', x, expit( x ) );
}#include "stdlib/math/base/special/expit.h"Computes the standard logistic function.
double out = stdlib_base_expit( 0.0 );
// returns ~0.5
out = stdlib_base_expit( 1.0 );
// returns ~0.731The function accepts the following arguments:
-
x:
[in] doubleinput value.
double stdlib_base_expit( const double x );#include "stdlib/math/base/special/expit.h"
#include <stdlib.h>
#include <stdio.h>
int main( void ) {
double x;
double v;
int i;
for ( i = 0; i < 100; i++ ) {
x = (double)rand() / (double)RAND_MAX;
v = stdlib_base_expit( x );
printf( "expit(%lf) = %lf\n", x, v );
}
}-
@stdlib/math-base/special/exp: natural exponential function. -
@stdlib/math-base/special/logit: logit function.
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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