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Round each component of a double-precision complex floating-point number to the nearest multiple of
10^n.
import croundn from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-croundn@esm/index.mjs';Rounds each component of a double-precision complex floating-point number to the nearest multiple of 10^n.
import Complex128 from 'https://cdn.jsdelivr.net/gh/stdlib-js/complex-float64-ctor@esm/index.mjs';
import real from 'https://cdn.jsdelivr.net/gh/stdlib-js/complex-float64-real@esm/index.mjs';
import imag from 'https://cdn.jsdelivr.net/gh/stdlib-js/complex-float64-imag@esm/index.mjs';
var v = croundn( new Complex128( -3.141592653589793, 3.141592653589793 ), -2 );
// returns <Complex128>
var re = real( v );
// returns -3.14
var im = imag( v );
// returns 3.14
v = croundn( new Complex128( -3.141592653589793, 3.141592653589793 ), 0 );
// returns <Complex128>
re = real( v );
// returns -3.0
im = imag( v );
// returns 3.0
v = croundn( new Complex128( -12368.0, 12368.0 ), 3 );
// returns <Complex128>
re = real( v );
// returns -12000.0
im = imag( v );
// returns 12000.0
v = croundn( new Complex128( NaN, NaN ), 3 );
// returns <Complex128>
re = real( v );
// returns NaN
im = imag( v );
// returns NaN-
When operating on floating-point numbers in bases other than
2, rounding to specified digits can be inexact. For example,import Complex128 from 'https://cdn.jsdelivr.net/gh/stdlib-js/complex-float64-ctor@esm/index.mjs'; import real from 'https://cdn.jsdelivr.net/gh/stdlib-js/complex-float64-real@esm/index.mjs'; import imag from 'https://cdn.jsdelivr.net/gh/stdlib-js/complex-float64-imag@esm/index.mjs'; var x = 0.2 + 0.1; // returns 0.30000000000000004 // Should round components to 0.3: var v = croundn( new Complex128( x, x ), -16 ); // returns <Complex128> var re = real( v ); // returns 0.3000000000000001 var im = imag( v ); // returns 0.3000000000000001
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
var uniform = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-uniform' ).factory;
import Complex128 from 'https://cdn.jsdelivr.net/gh/stdlib-js/complex-float64-ctor@esm/index.mjs';
import floor from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-floor@esm/index.mjs';
import croundn from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-croundn@esm/index.mjs';
var rand1 = uniform( -5.0, 0.0 );
var rand2 = uniform( -50.0, 50.0 );
var z;
var i;
var n;
for ( i = 0; i < 100; i++ ) {
z = new Complex128( rand2(), rand2() );
n = floor( rand1() );
console.log( 'croundn(%s, %s) = %s', z, n, croundn( z, n ) );
}
</script>
</body>
</html>@stdlib/math-base/special/cceiln: round each component of a double-precision complex floating-point number to the nearest multiple of 10^n toward positive infinity.@stdlib/math-base/special/cfloorn: round each component of a double-precision complex floating-point number to the nearest multiple of 10^n toward negative infinity.@stdlib/math-base/special/cround: round each component of a double-precision complex floating-point number to the nearest integer.
This package is part of stdlib, a standard library 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.
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