README.md

round10f

Round a numeric value to the nearest power of ten using single-precision floating-point arithmetic.

Usage

var round10f = require( '@stdlib/math/base/special/round10f' );

round10f( x )

Rounds a numeric value to the nearest power of ten using single-precision floating-point arithmetic.

var y;

y = round10f( 3.1415926 );
// returns 1.0

y = round10f( 123.456 );
// returns 100.0

y = round10f( -2.5 );
// returns -1.0

y = round10f( -0.0 );
// returns -0.0

Examples

var uniform = require( '@stdlib/random/array/uniform' );
var logEachMap = require( '@stdlib/console/log-each-map' );
var round10f = require( '@stdlib/math/base/special/round10f' );

var opts = {
    'dtype': 'float32'
};

var x = uniform( 100, -50.0, 50.0, opts );

logEachMap( 'x: %0.4f => %0.4f', x, round10f );

---

C APIs

This package provides a C API for rounding single-precision floating-point numbers to the nearest power of \(10\).

Usage

#include "stdlib/math/base/special/round10f.h"

stdlib_base_round10f( x )

Rounds a single-precision floating-point number to the nearest power of ten.

float out = stdlib_base_round10f( 3.14f );
// returns 1.0f

out = stdlib_base_round10f( 123.456f );
// returns 100.0f

Arguments

• x: [in] float input value.

Returns

• float: rounded value.

float stdlib_base_round10f( const float x );

Examples

#include "stdlib/math/base/special/round10f.h"
#include <stdio.h>

int main( void ) {
    const float x[] = {
        -5.0f, -3.89f, -2.78f, -1.67f, -0.56f,
         0.56f,  1.67f,  2.78f,  3.89f,  5.0f
    };

    float v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_round10f( x[ i ] );
        printf( "round10f(%f) = %f\n", x[ i ], v );
    }
}

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See Also

• @stdlib/math/base/special/ceil10: round a numeric value to the nearest power of 10 toward positive infinity.
• @stdlib/math/base/special/floor10: round a numeric value to the nearest power of 10 toward negative infinity.
• @stdlib/math/base/special/round: round a numeric value to the nearest integer.
• @stdlib/math/base/special/round2: round a numeric value to the nearest power of two on a linear scale.