About stdlib...
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.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
cidentity
Evaluate the identity function of a double-precision complex floating-point number.
The identity-function is defined as
for all z
.
Installation
npm install @stdlib/math-base-special-cidentity
Usage
var cidentity = require( '@stdlib/math-base-special-cidentity' );
cidentity( z )
Evaluates the identity function for a double-precision complex floating-point number.
var Complex128 = require( '@stdlib/complex-float64' );
var real = require( '@stdlib/complex-real' );
var imag = require( '@stdlib/complex-imag' );
var v = cidentity( new Complex128( -1.0, 2.0 ) );
// returns <Complex128>
var re = real( v );
// returns -1.0
var im = imag( v );
// returns 2.0
Examples
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var Complex128 = require( '@stdlib/complex-float64' );
var cidentity = require( '@stdlib/math-base-special-cidentity' );
var z;
var i;
for ( i = 0; i < 100; i++ ) {
z = new Complex128( discreteUniform( -50, 50 ), discreteUniform( -50, 50 ) );
console.log( 'identity(%s) = %s', z, cidentity( z ) );
}
C APIs
Usage
#include "stdlib/math/base/special/cidentity.h"
stdlib_base_cidentity( z )
Evaluates the identity function for a double-precision complex floating-point number.
#include "stdlib/complex/float64.h"
#include "stdlib/complex/real.h"
#include "stdlib/complex/imag.h"
stdlib_complex128_t z = stdlib_complex128( 2.5, -1.5 );
stdlib_complex128_t out = stdlib_base_cidentity( z );
double re = stdlib_real( out );
// returns 2.5
double im = stdlib_imag( out );
// returns -1.5
The function accepts the following arguments:
-
z:
[in] stdlib_complex128_t
input value.
stdlib_complex128_t stdlib_base_cidentity( const stdlib_complex128_t z );
Examples
#include "stdlib/math/base/special/cidentity.h"
#include "stdlib/complex/float64.h"
#include "stdlib/complex/reim.h"
#include <stdio.h>
int main() {
const stdlib_complex128_t x[] = {
stdlib_complex128( 3.14, 1.5 ),
stdlib_complex128( -3.14, -1.5 ),
stdlib_complex128( 0.0, 0.0 ),
stdlib_complex128( 0.0/0.0, 0.0/0.0 )
};
stdlib_complex128_t v;
stdlib_complex128_t y;
double re1;
double im1;
double re2;
double im2;
int i;
for ( i = 0; i < 4; i++ ) {
v = x[ i ];
y = stdlib_base_cidentity( v );
stdlib_reim( v, &re1, &im1 );
stdlib_reim( y, &re2, &im2 );
printf( "cidentity(%lf + %lfi) = %lf + %lfi\n", re1, im1, re2, im2 );
}
}
See Also
-
@stdlib/math-base/special/cidentityf
: evaluate the identity function for a single-precision complex floating-point number. -
@stdlib/math-base/special/identity
: evaluate the identity function for a double-precision floating-point number.
Notice
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.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2024. The Stdlib Authors.