@stdlib/math-base-special-copysign
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Return a double-precision floating-point number with the magnitude of x and the sign of y.
@stdlib/math-base-special-copysign is a utility for copying the sign of a number to another number. This can be useful in various mathematical computations where the sign of a number needs to be manipulated or transferred.
Copying the sign of a number
This feature allows you to copy the sign of one number to another. In this example, the sign of `y` (-2.0) is copied to `x` (3.14), resulting in -3.14.
const copysign = require('@stdlib/math-base-special-copysign');
const x = 3.14;
const y = -2.0;
const result = copysign(x, y);
console.log(result); // -3.14mathjs is a comprehensive math library for JavaScript and Node.js. It provides a wide range of mathematical functions, including the ability to manipulate the sign of numbers using the `math.sign` function. However, it is more feature-rich and general-purpose compared to @stdlib/math-base-special-copysign.
lodash is a popular utility library that provides various functions for common programming tasks, including mathematical operations. While lodash does not have a direct equivalent to `copysign`, it offers a wide range of utilities that can be used to achieve similar results through custom implementations.
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
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Return a double-precision floating-point number with the magnitude of
xand the sign ofy.
npm install @stdlib/math-base-special-copysign
var copysign = require( '@stdlib/math-base-special-copysign' );
Returns a double-precision floating-point number with the magnitude of x and the sign of y.
var z = copysign( -3.14, 10.0 );
// returns 3.14
z = copysign( 3.14, -1.0 );
// returns -3.14
z = copysign( 1.0, -0.0 );
// returns -1.0
z = copysign( -3.14, -0.0 );
// returns -3.14
z = copysign( -0.0, 1.0 );
// returns 0.0
NaN has a biased exponent equal to 2047, a significand greater than 0, and a sign bit equal to either 1 or 0. In which case, NaN may not correspond to just one but many binary representations. Accordingly, care should be taken to ensure that y is not NaN; otherwise, behavior may be indeterminate.var randu = require( '@stdlib/random-base-randu' );
var copysign = require( '@stdlib/math-base-special-copysign' );
var x;
var y;
var z;
var i;
// Generate random double-precision floating-point numbers `x` and `y` and copy the sign of `y` to `x`...
for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
y = (randu()*10.0) - 5.0;
z = copysign( x, y );
console.log( 'x: %d, y: %d => %d', x, y, z );
}
#include "stdlib/math/base/special/copysign.h"
Returns a double-precision floating-point number with the magnitude of x and the sign of y.
double v = stdlib_base_copysign( -3.14, 10.0 );
// returns 3.14
double v = stdlib_base_copysign( 3.14, -1.0 );
// returns -3.14
The function accepts the following arguments:
[in] double number from which to derive a magnitude.[in] double number from which to derive a sign.double stdlib_base_copysign( const double x, const double y );
#include "stdlib/math/base/special/copysign.h"
#include <stdio.h>
int main( void ) {
const double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
double y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_copysign( x[ i ], -3.0 );
printf( "copysign(%lf, %lf) = %lf\n", x[ i ], -3.0, y );
}
}
@stdlib/math-base/special/flipsign: return a double-precision floating-point number with the magnitude of x and the sign of x*y.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.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.
FAQs
Return a double-precision floating-point number with the magnitude of x and the sign of y.
The npm package @stdlib/math-base-special-copysign receives a total of 311,548 weekly downloads. As such, @stdlib/math-base-special-copysign popularity was classified as popular.
We found that @stdlib/math-base-special-copysign demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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