logitf

Compute the logit function for a single-precision floating-point number.

The logit function is defined as the logarithm of the odds p / (1-p); i.e.,

The logit function is the inverse of the standard logistic function, sometimes also called the sigmoid function.

Installation

npm install @stdlib/math-base-special-logitf

Usage

var logitf = require( '@stdlib/math-base-special-logitf' );

logitf( p )

Computes the logit function for a single-precision floating-point number.

var v = logitf( 0.2 );
// returns ~-1.386

v = logitf( 0.9 );
// returns ~2.197

If p < 0 or p > 1, the function returns NaN.

var v = logitf( 1.3 );
// returns NaN

v = logitf( -0.2 );
// returns NaN

Examples

var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var logitf = require( '@stdlib/math-base-special-logitf' );

var opts = {
    'dtype': 'float32'
};
var p = uniform( 100, 0.0, 1.0, opts );

logEachMap( 'logitf(%0.4f) = %0.4f', p, logitf );

C APIs

Usage

#include "stdlib/math/base/special/logitf.h"

stdlib_base_logitf( p )

Computes the logit function for a single-precision floating-point number.

float out = stdlib_base_logitf( 0.2f );
// returns ~-1.386f

out = stdlib_base_logitf( 0.9f );
// returns ~2.197f

The function accepts the following arguments:

• p: [in] float input value.

float stdlib_base_logitf( const float p );

Examples

#include "stdlib/math/base/special/logitf.h"
#include <stdlib.h>
#include <stdio.h>

int main( void ) {
    float x;
    float v;
    int i;

    for ( i = 0; i < 100; i++ ) {
        x = (float)rand() / (float)RAND_MAX;
        v = stdlib_base_logitf( x );
        printf( "logitf(%f) = %f\n", x, v );
    }
}

Notice

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.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.