floorsd

Round a numeric value to the nearest number toward negative infinity with N significant figures.

Usage

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

floorsd( x, n, b )

Rounds a numeric value to the nearest number toward negative infinity with n significant figures.

var v = floorsd( 3.141592653589793, 5, 10 );
// returns 3.1415

v = floorsd( 3.141592653589793, 1, 10 );
// returns 3.0

v = floorsd( 12368.0, 2, 10 );
// returns 12000.0

v = floorsd( 0.0313, 2, 2 );
// returns 0.03125

Examples

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

var opts = {
    'dtype': 'float32'
};
var x = uniform( 100, -5000.0, 5000.0, opts );

logEachMap( 'x: %0.4f. y: %d. z: %d. Rounded: %0.4f.', x, 5, 10, floorsd );

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C APIs

Usage

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

stdlib_base_floorsd( x, n, b )

Rounds a numeric value to the nearest number toward negative infinity with n significant figures.

double out = stdlib_base_floorsd( 0.0313, 2, 2 );
// returns 0.03125

The function accepts the following arguments:

• x: [in] double input value.
• n: [in] int32_t number of significant figures.
• b: [in] int32_t base.

double stdlib_base_floorsd( const double x, const int32_t n, const int32_t b );

Examples

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

int main( void ) {
    const double x[] = { -5.0, -3.89, -2.78, -1.67, -0.56, 0.56, 1.67, 2.78, 3.89, 5.0 };
    const int32_t n[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    const int32_t b[] = { 20, 19, 18, 17, 16, 15, 14, 13, 12, 11 };

    double v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_floorsd( x[ i ], n[ i ], b[ i ] );
        printf( "floorsd(%lf, %d, %d) = %lf\n", x[ i ], n[ i ], b[ i ], v );
    }
}

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See Also

• @stdlib/math/base/special/ceilsd: round a numeric value to the nearest number toward positive infinity with N significant figures.
• @stdlib/math/base/special/floor: round a double-precision floating-point number toward negative infinity.
• @stdlib/math/base/special/roundsd: round a numeric value to the nearest number with N significant figures.
• @stdlib/math/base/special/truncsd: round a numeric value to the nearest number toward zero with N significant figures.