73 lines
2.0 KiB
Markdown
73 lines
2.0 KiB
Markdown
---
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title: Gamma function
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id: 5a23c84252665b21eecc7e76
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challengeType: 5
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videoUrl: ''
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localeTitle: 伽玛功能
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---
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## Description
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<section id="description">实现一个算法（或更多）来计算<a href="https://en.wikipedia.org/wiki/Gamma function">Gamma</a> （$ \ Gamma $）函数（仅在实际字段中）。 Gamma功能可以定义为： <div style="padding-left: 4em;"> <big><big>$ \ Gamma（x）= \ displaystyle \ int_0 ^ \ infty t ^ {x-1} e ^ { - t} dt $</big></big> </div></section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>gamma</code>应该是一个功能。
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testString: assert(typeof gamma=='function')
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- text: '<code>gamma("+tests[0]+")</code>应该返回一个数字。'
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testString: assert(typeof gamma(.1)=='number')
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- text: '<code>gamma("+tests[0]+")</code>应该返回<code>"+results[0]+"</code> 。'
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testString: assert.equal(round(gamma(.1)), round(9.513507698668736))
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- text: '<code>gamma("+tests[1]+")</code>应该返回<code>"+results[1]+"</code> 。'
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testString: assert.equal(round(gamma(.2)), round(4.590843711998803))
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- text: '<code>gamma("+tests[2]+")</code>应该返回<code>"+results[2]+"</code> 。'
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testString: assert.equal(round(gamma(.3)), round(2.9915689876875904))
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- text: '<code>gamma("+tests[3]+")</code>应该返回<code>"+results[3]+"</code> 。'
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testString: assert.equal(round(gamma(.4)), round(2.218159543757687))
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- text: '<code>gamma("+tests[4]+")</code>应返回<code>"+results[4]+"</code> 。'
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testString: assert.equal(round(gamma(.5)), round(1.7724538509055159))
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function gamma (x) {
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// Good luck!
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}
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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console.info('after the test');
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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