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52 lines
1.4 KiB
Markdown
52 lines
1.4 KiB
Markdown
---
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layout: default
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---
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<!-- Note: This file is automatically generated from source code comments. Changes made in this file will be overridden. -->
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<h1 id="function-invmod">Function invmod <a href="#function-invmod" title="Permalink">#</a></h1>
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Calculate the (modular) multiplicative inverse of a modulo b. Solution to the equation `ax ≣ 1 (mod b)`
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See https://en.wikipedia.org/wiki/Modular_multiplicative_inverse.
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<h2 id="syntax">Syntax <a href="#syntax" title="Permalink">#</a></h2>
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```js
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math.invmod(a, b)
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```
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<h3 id="parameters">Parameters <a href="#parameters" title="Permalink">#</a></h3>
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Parameter | Type | Description
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--------- | ---- | -----------
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`a` | number | BigNumber | An integer number
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`b` | number | BigNumber | An integer number
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<h3 id="returns">Returns <a href="#returns" title="Permalink">#</a></h3>
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Type | Description
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---- | -----------
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number | BigNumber | Returns an integer number where `invmod(a,b)*a ≣ 1 (mod b)`
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<h3 id="throws">Throws <a href="#throws" title="Permalink">#</a></h3>
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Type | Description
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---- | -----------
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<h2 id="examples">Examples <a href="#examples" title="Permalink">#</a></h2>
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```js
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math.invmod(8, 12) // returns NaN
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math.invmod(7, 13) // returns 2
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math.invmod(15151, 15122) // returns 10429
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```
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<h2 id="see-also">See also <a href="#see-also" title="Permalink">#</a></h2>
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[gcd](gcd.html),
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[xgcd](xgcd.html)
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