108 lines
2.3 KiB
Markdown
108 lines
2.3 KiB
Markdown
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# Ceil
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> Round a complex number toward positive infinity.
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<section class="usage">
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## Usage
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```javascript
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var cceil = require( '@stdlib/math/base/special/cceil' );
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```
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#### cceil( \[out,] re, im )
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Rounds a `complex` number comprised of a **real** component `re` and an **imaginary** component `im` toward positive infinity.
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```javascript
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var v = cceil( -4.2, 5.5 );
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// returns [ -4.0, 6.0 ]
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v = cceil( 9.99999, 0.1 );
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// returns [ 10.0, 1.0 ]
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v = cceil( 0.0, 0.0 );
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// returns [ 0.0, 0.0 ]
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v = cceil( NaN, NaN );
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// returns [ NaN, NaN ]
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```
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By default, the function returns real and imaginary components as a two-element `array`. To avoid unnecessary memory allocation, the function supports providing an output (destination) object.
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```javascript
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var Float32Array = require( '@stdlib/array/float32' );
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var out = new Float32Array( 2 );
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var v = cceil( out, -4.2, 5.5 );
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// returns <Float32Array>[ -4.0, 6.0 ]
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var bool = ( v === out );
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// returns true
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var Complex128 = require( '@stdlib/complex/float64' );
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var randu = require( '@stdlib/random/base/randu' );
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var real = require( '@stdlib/complex/real' );
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var imag = require( '@stdlib/complex/imag' );
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var cceil = require( '@stdlib/math/base/special/cceil' );
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var re;
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var im;
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var z;
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var o;
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var w;
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var i;
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for ( i = 0; i < 100; i++ ) {
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re = ( randu()*100.0 ) - 50.0;
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im = ( randu()*100.0 ) - 50.0;
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z = new Complex128( re, im );
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o = cceil( real(z), imag(z) );
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w = new Complex128( o[ 0 ], o[ 1 ] );
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console.log( 'ceil(%s) = %s', z.toString(), w.toString() );
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}
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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</section>
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<!-- /.links -->
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