README.md (1846B)
1 <!-- 2 3 @license Apache-2.0 4 5 Copyright (c) 2018 The Stdlib Authors. 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 19 --> 20 21 # Gamma Delta Ratio 22 23 > Compute the ratio of two [gamma][@stdlib/math/base/special/gamma] functions. 24 25 <section class="usage"> 26 27 ## Usage 28 29 ```javascript 30 var gammaDeltaRatio = require( '@stdlib/math/base/special/gamma-delta-ratio' ); 31 ``` 32 33 #### gammaDeltaRatio( z, delta ) 34 35 Computes the ratio of two [gamma functions][@stdlib/math/base/special/gamma]. Specifically, the function evaluates `Γ( z ) / Γ( z + delta )`. 36 37 ```javascript 38 var y = gammaDeltaRatio( 2.0, 3.0 ); 39 // returns ~0.042 40 41 y = gammaDeltaRatio( 4.0, 0.5 ); 42 // returns ~0.516 43 44 y = gammaDeltaRatio( 100.0, 0.0 ); 45 // returns 1.0 46 ``` 47 48 </section> 49 50 <!-- /.usage --> 51 52 <section class="examples"> 53 54 ## Examples 55 56 <!-- eslint no-undef: "error" --> 57 58 ```javascript 59 var randu = require( '@stdlib/random/base/randu' ); 60 var gammaDeltaRatio = require( '@stdlib/math/base/special/gamma-delta-ratio' ); 61 62 var delta; 63 var z; 64 var i; 65 66 for ( i = 0; i < 100; i++ ) { 67 z = randu()*10.0; 68 delta = randu()*10.0; 69 console.log( 'gamma( %d ) / gamma( %d + %d ) = %d', z, z, delta, gammaDeltaRatio( z, delta ) ); 70 } 71 ``` 72 73 </section> 74 75 <!-- /.examples --> 76 77 <section class="links"> 78 79 [@stdlib/math/base/special/gamma]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/gamma 80 81 </section> 82 83 <!-- /.links -->