Logit function for a single-precision floating-point number.
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> Compute the [logit][logit] function for a single-precision floating-point number.
The [logit][logit] function is defined as the logarithm of the odds p / (1-p); i.e.,
The [logit][logit] function is the inverse of the [standard logistic][standard-logistic] function, sometimes also called the sigmoid function.
``bash`
npm install @stdlib/math-base-special-logitf
`javascript`
var logitf = require( '@stdlib/math-base-special-logitf' );
#### logitf( p )
Computes the [logit][logit] function for a single-precision floating-point number.
`javascript
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.
`javascript
var v = logitf( 1.3 );
// returns NaN
v = logitf( -0.2 );
// returns NaN
`
`javascript
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`
#include "stdlib/math/base/special/logitf.h"
#### stdlib_base_logitf( p )
Computes the [logit][logit] function for a single-precision floating-point number.
`c
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.
`c`
float stdlib_base_logitf( const float p );
`c
#include "stdlib/math/base/special/logitf.h"
#include
#include
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 );
}
}
`
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
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[logit]: https://en.wikipedia.org/wiki/Logit
[standard-logistic]: https://en.wikipedia.org/wiki/Logistic_function