60 lines
1.2 KiB
Markdown
60 lines
1.2 KiB
Markdown
---
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id: 5a23c84252665b21eecc7e76
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title: 伽玛功能
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challengeType: 5
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videoUrl: ''
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---
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# --description--
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实现一个算法（或更多）来计算[Gamma](<https://en.wikipedia.org/wiki/Gamma function>) （$ \\ Gamma $）函数（仅在实际字段中）。 Gamma功能可以定义为：
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$ \\ Gamma（x）= \\ displaystyle \\ int_0 ^ \\ infty t ^ {x-1} e ^ { - t} dt $
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# --hints--
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`gamma`应该是一个功能。
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```js
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assert(typeof gamma == 'function');
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```
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`gamma("+tests[0]+")`应该返回一个数字。
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```js
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assert(typeof gamma(0.1) == 'number');
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```
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`gamma("+tests[0]+")`应该返回`"+results[0]+"` 。
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```js
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assert.equal(round(gamma(0.1)), round(9.513507698668736));
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```
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`gamma("+tests[1]+")`应该返回`"+results[1]+"` 。
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```js
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assert.equal(round(gamma(0.2)), round(4.590843711998803));
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```
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`gamma("+tests[2]+")`应该返回`"+results[2]+"` 。
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```js
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assert.equal(round(gamma(0.3)), round(2.9915689876875904));
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```
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`gamma("+tests[3]+")`应该返回`"+results[3]+"` 。
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```js
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assert.equal(round(gamma(0.4)), round(2.218159543757687));
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```
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`gamma("+tests[4]+")`应返回`"+results[4]+"` 。
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```js
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assert.equal(round(gamma(0.5)), round(1.7724538509055159));
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```
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# --solutions--
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