README.md

Identity Function

Evaluate the identity function of a single-precision floating-point number.

The identity-function is defined as

$$f(x) = x$$

for all x.

Usage

var identityf = require( '@stdlib/number/float32/base/identity' );

identityf( x )

Evaluates the identity function for a single-precision floating-point number.

var v = identityf( -1.0 );
// returns -1.0

v = identityf( 2.0 );
// returns 2.0

v = identityf( 0.0 );
// returns 0.0

v = identityf( -0.0 );
// returns -0.0

v = identityf( NaN );
// returns NaN

Examples

var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
var logEachMap = require( '@stdlib/console/log-each-map' );
var identityf = require( '@stdlib/number/float32/base/identity' );

var x = discreteUniform( 100, -50, 50 );

logEachMap( 'identity(%d) = %d', x, identityf );

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C APIs

Usage

#include "stdlib/number/float32/base/identity.h"

stdlib_base_float32_identity( x )

Evaluates the identity function for a single-precision floating-point number.

float y = stdlib_base_float32_identity( 2.0f );
// returns 2.0f

The function accepts the following arguments:

• x: [in] float input value.

float stdlib_base_float32_identity( const float x );

Examples

#include "stdlib/number/float32/base/identity.h"
#include <stdio.h>

int main( void ) {
    const float x[] = { 3.14f, -3.14f, 0.0f, 0.0f/0.0f };

    float y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        y = stdlib_base_float32_identity( x[ i ] );
        printf( "f(%f) = %f\n", x[ i ], y );
    }
}

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See Also

• @stdlib/number/float64/base/identity: evaluate the identity function for a double-precision floating-point number.