124 lines
2.1 KiB
Markdown
124 lines
2.1 KiB
Markdown
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<!--
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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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# trunc10
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> Round a numeric value to the nearest power of 10 toward zero.
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<section class="usage">
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## Usage
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```javascript
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var trunc10 = require( '@stdlib/math/base/special/trunc10' );
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```
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#### trunc10( x )
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Rounds a `numeric` value to the nearest power of 10 toward zero.
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```javascript
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var v = trunc10( -4.2 );
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// returns -1.0
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v = trunc10( -4.5 );
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// returns -1.0
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v = trunc10( -4.6 );
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// returns -1.0
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v = trunc10( 9.99999 );
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// returns 1.0
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v = trunc10( 9.5 );
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// returns 1.0
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v = trunc10( 13.0 );
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// returns 10.0
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v = trunc10( -13.0 );
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// returns -10.0
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v = trunc10( 0.0 );
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// returns 0.0
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v = trunc10( -0.0 );
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// returns -0.0
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v = trunc10( Infinity );
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// returns Infinity
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v = trunc10( -Infinity );
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// returns -Infinity
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v = trunc10( NaN );
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// returns NaN
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```
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- The function may not return accurate results for subnormals due to a general loss in precision.
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```javascript
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var v = trunc10( 1.0e-323 ); // should return 1.0e-323
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// returns 0.0
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```
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</section>
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<!-- /.notes -->
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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 randu = require( '@stdlib/random/base/randu' );
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var trunc10 = require( '@stdlib/math/base/special/trunc10' );
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var x;
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var v;
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var i;
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for ( i = 0; i < 100; i++ ) {
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x = (randu()*100.0) - 50.0;
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v = trunc10( x );
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console.log( 'Value: %d. Rounded: %d.', x, v );
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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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