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math-float64-copysign
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Readme
Returns a double-precision floating-point number with the magnitude of
x
and the sign ofy
.
$ npm install math-float64-copysign
var copysign = require( 'math-float64-copysign' );
Returns a double-precision floating-point number with the magnitude of x
and the sign of y
.
var z = copysign( -3.14, 10 );
// returns 3.14
z = copysign( 3.14, -1 );
// returns -3.14
z = copysign( 1, -0 );
// returns -1
z = copysign( -3.14, -0 );
// returns -3.14
z = copysign( -0, 1 );
// returns 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
, else behavior may be indeterminate.var copysign = require( 'math-float64-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 = Math.random()*100 - 50;
y = Math.random()*10 - 5;
z = copysign( x, y );
console.log( 'x: %d, y: %d => %d', x, y, z );
}
To run the example code from the top-level application directory,
$ node ./examples/index.js
This repository uses tape for unit tests. To run the tests, execute the following command in the top-level application directory:
$ make test
All new feature development should have corresponding unit tests to validate correct functionality.
This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:
$ make test-cov
Istanbul creates a ./reports/coverage
directory. To access an HTML version of the report,
$ make view-cov
This repository uses Testling for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:
$ make test-browsers
To view the tests in a local web browser,
$ make view-browser-tests
Copyright © 2016. The Compute.io Authors.
FAQs
Returns a double-precision floating-point number with the magnitude of x and the sign of y.
The npm package math-float64-copysign receives a total of 2,169 weekly downloads. As such, math-float64-copysign popularity was classified as popular.
We found that math-float64-copysign demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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